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

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%