Help with simple and compound intrest! plz help! due 2maro.?

Question

hi! my teacher does a part of a chapter each day like to day wuz 3.8 yesterday wuz 3.7, b4 tat 3.6. and there is not enough time to review much or anything so please help! its 1-16!!!!!  
find the amount of the simple interest earned for #'s 1 through 8 

1) principal: $620
    annual rate: 3.5%
    time: 2 yrs.

2) principal: $500
    annual rate: 6.5
    time: 32 months

3) principle: $750
    annual rate: 3.5%
    time: 18 months

4) principal: $2000
    annual rate: 4%
    time: 5 yrs.
for an account that earns simple annual intrest, find the balance of the account. 
this might help!:
                       I = prt    I= intrest  P= principle R= intrest rate T= time in years (not months)

5) P=$400,r = 3%,t=6 years

6)p=$950, r =4.5,t = =5 yrs.

7) p= $1500,r=2%,t = 4months

8)p = $2400, r = 3.25 t,= 5 years

9 -13 needs to be a COMPOUND INTREST 

9) principle $1200 
    annual rate: 4%
    time: 3 years

10) princible: $3500
      annual rate: 3.6%
      time: 54 months 
11) principal: $840
      annual rate: 2.75%
      time: 3 yrs.

12) principal: $1550
      annual rate: 5.8
      time: 54 months

13) you deposit $700 in a saving account that pays 4.2% simple annual interest. how much will you have in you account after 63 months?

14) on january 1st, a credit card has a balance of $680 the credit card company charges an interest rate of 18.5% compounded annually. if no payment or purchases are made, what is the balance on febuary 1st?

15) the account below earn intrest compounded annually. which account will have the greater balance in the given time? explain your reasoning. 
Account A                                     Account B

principal:$350                             principal: $350
annual rate: 2.25%                      annual rate: 4.5
time: 20 yrs.                               time: 10 yrs.

16) how much money must yu deposit into a savings account that pays 4.8% simple annual intrest to have a balance of $1850 after 10 yrs?

please, this is weird but when summiting your answer, please do NOT show your work! and please do this:

1. your answer
2. your answer
ect....  

THANKS SO MUCH!!!!

Rose · Accepted Answer

What you have been given is revision; which means that your teacher expects that you know both simple and compound interest. it also means that you will soon be learning new work.

My point is, if you do not understand this work, then you must ask about it as these lessons are now finished. It is not difficult as simple interest is learned in primary school. Compound interest uses the same formulas but it adds the interest each year, as the bank does with your savings. Learn it now!

mawhinney · Answer

Let's say you have got $one hundred and also you make investments it at five% annual curiosity. If it is uncompounded (useful curiosity) you're making $five in line with 12 months. However if it is compounded per thirty days, after the primary month you have got forty two cents further for your customary $one hundred ($five divided via 12 on account that there are year). So now you're incomes curiosity on $one hundred.forty two in the course of the moment month. Each month the quantity further grows a bit bit, so each and every month you are incomes curiosity on a bit bit greater than you had been the prior month. So compounded, after a 12 months you can have extra than simply $five. Some banks compound day-to-day, a few per thirty days, or some thing. There's 2 yields, the APY (compounded) and the useful, on the grounds that a few folks do not desire to compound their curiosity, they simply desire to spend it.

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Help with simple and compound intrest! plz help! due 2maro.?

2 Answers