Andrew's bank account started off with a deposit of $750, and after 4 years he earned $165 in interest. The interest is simple interest, calculated on the basis of the initial deposit. What is the interest rate that Andrew's bank provides? Give your answer as a percentage to the nearest tenth of a percent. Do not include the percent symbol in your answer

Step-by-step explanation:

we know that

The simple interest formula is equal to

where

I is the Final Interest Value

P is the Principal amount of money to be invested

r is the rate of interest  

t is Number of Time Periods

in this problem we have

substitute in the formula above

Solve for r

Convert to percentage

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80