Frank invests $1,000 in simple interest investment account that pays 8% a year. after a number of years, he withdraws his balance of $2,200. using the formula l=prt, how many years was his money invested? 2.75 years 10 years 15 years 27.5 years

Step-by-step explanation:

we know that

The simple interest formula is equal to

where

A is the Final Investment Value

I is the amount of money in Interest  

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

Find the interest I

substitute in the formula above

Solve for t

i just took the test, the correct answer is .. 31.5 in.