well when your finding a percent of any number its pretty simple.
Here is the equation for this problem.
0.05*90=5% of $90
do the math, 90*.05=4.5
4.5 would be your answer.
When finding a percent of a number, convert the percent into a decimal and multiply it by the whole number.
10% of 50 = 0.10*50
7% of 20 = 0.07*20
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This would be the formula for finding compound interest.
P would equal how much you borrow or deposit.
r would equal a decimal of your rate of interest
t would equal how many years your borrowed or deposited value has been in/out for
n would equal how many times the interest was compunded in a year
A would equal the ammount of money and interest owed/accumulated in n years
Sorry this is late '=)
Well the first question is simple! find the equation that could equal 1021 dollars, note in A at the end of 13.25 there is an s, this s is an unknown number that 13.25 will be multiplied by. so if we subtract 650 from 1021 we will find how much more we need. 1021-650= 371. so divide 650 by 13.25 and you will find S