easy 10 points, math?

c) 18

d)16.80

To do these questions, you just need to look at the discount amount, and think ok, 25% discount means that they're paying 75% of the cost.

So take 13.50 and divide by 75 to get 1% of the cost, and then times by 100 to get the full (original) cost

deposite 505 dollars in savings account

simple interest rate us 4.5%

How much interest will it earn in 4 years?

I = Principle x rate x time

= $505 x 0.045 x 4

= $90.90

deposites 4300

interes rate is 2.25% how much will she have in 3 and 1/4 years:

I = Principle x rate x time

= $4300 x 0.0225 x 3.25

= $314.45

Sorry, I don't remember exactly how to do the last two, but it seems someone above me knows how :)

48

48 is the answer of ur question!

i m true because i m expert in maths!

3) 54

4) 50.4