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X Company is trying to decide whether to continue using old equipment to make Product A or replace it with new equipment that will have lower operating costs. The following information is available:

The new equipment will cost $50,000. Disposal value at the end of its 5-year useful life will be $5,000.

The old equipment was purchased 3 years ago for $25,000. It can be sold immediately for $5,000 but will have zero disposal value in 5 years.

Maintenance work, costing $2,500, will be necessary on the old equipment in Year 4.

The new equipment will result in $9,000 of operating cost savings each year.

Assuming a discount rate of 6%, what is the net present value of replacing the old equipment with the new equipment?

X Company is trying to decide whether to continue using old equipment to make Product A or replace it with new equipment that will have lower operating costs.

I got $2,210 when trying this problem but that was wrong, any tips on how to go about it?

X Company is trying to decide whether to continue using old equipment to make Product A or replace it with new equipment that will have lower operating costs. The following information is available:

The new equipment will cost $50,000. Disposal value at the end of its 5-year useful life will be $5,000.

The old equipment was purchased 3 years ago for $25,000. It can be sold immediately for $5,000 but will have zero disposal value in 5 years.

Maintenance work, costing $2,500, will be necessary on the old equipment in Year 4.

The new equipment will result in $9,000 of operating cost savings each year.

Assuming a discount rate of 6%, what is the net present value of replacing the old equipment with the new equipment?

X Company is trying to decide whether to continue using old equipment to make Product A or replace it with new equipment that will have lower operating costs. The following information is available:

The new equipment will cost $50,000. Disposal value at the end of its 5-year useful life will be $5,000.

The old equipment was purchased 3 years ago for $25,000. It can be sold immediately for $5,000 but will have zero disposal value in 5 years.

Maintenance work, costing $2,500, will be necessary on the old equipment in Year 4.

The new equipment will result in $9,000 of operating cost savings each year.

Assuming a discount rate of 6%, what is the net present value of replacing the old equipment with the new equipment?

I got $2,240 but that was wrong and I'm not really sure how to go about this problem. I'm not asking for the answer necessarily, I just need some help for how to do it. 

X Company currently buys 8,000 units of a part each year from a supplier for $7.90 per part, but it is considering making the part instead. In order to make the part, X Company will have to buy equipment that will cost $150,000. The equipment will last for 6 years, at which time it will have zero disposal value. X Company estimates that it will cost $31,730 a year to make all 8,000 units.

What is the approximate rate of return if X Company makes the part instead of buying it from the supplier? I got -10% but that's wrong. 

X Company is starting a new merchandising business and provides the following budgets for its two products:

  Product Revenue Total CM  

       A      $337,608   $119,232  

       B      259,005    42,005  

Next year's budgeted fixed costs are $250,000. X Company would like to at least break even in its first year of operation; what must total sales be in order for that to happen [round unit numbers to two decimal places]? Assume that the budgeted product mix will not change.

X Company is starting a new merchandising business and provides the following budgets for its two products:

  Product Revenue Total CM  

       A $337,608 $119,232  

       B 259,005 42,005  

Next year's budgeted fixed costs are $250,000. X Company would like to at least break even in its first year of operation; what must total sales be in order for that to happen [round unit numbers to two decimal places]? Assume that the budgeted product mix will not change.

How do you calculate the maximum amount of profit in an equation Q = 120 - 30P, where P is the price and Q is the quantity of customers buying the product, with the Marginal Cost being $1? I tried following the guidelines in the math book but they were vague and unhelpful on what the process is.

So I've got this function which is supposed to test whether a number is a float/integer or isn't. I'm using this try-except function to test for this but for some reason I'm getting an assertion error.

def float_check(number):

... try:

... ... float(number)

... ... answer = True

... except ValueError:

... ... answer = False

... return answer4

This results in an assertion error for the program. This is the input for which the function is supposed to apply:

import float_check

assert float_check('1234') == True

assert float_check('123.45') == True

assert float_check('123.45.67') == False

assert float_check('34e46') == False

assert float_check('.45') == True

assert float_check('45.') == True

assert float_check('45..') == False

So I have a pretty simple function designed to take the last "n" number of letters in a string and move them to the front of the string, unless the string is only one letter in which case it just returns it without changing it. But for some reason I keep getting an "assertion error", and I'm not sure what's wrong with the function.

def rotate(s,n):

... s = str(s)

... n = int(n)

... if len(s) > 1:

... ... return(s[-n:] + s)

... else:

... ... return(s)

opened_text = open("test.txt")

line_string = opened_text.read()

print(line_string.replace(" ","").strip())

So the code above in Python is supposed to remove all blank spaces and newlines after opening up a text file, but the problem is that while it is removing the blank spaces, it is not removing the newlines. How do I fix it so that all the words are on the same line?