Maggie is considering two investments. investment a investment b principal $10,000 $8,000 interest rate 3% 2.8% time in years 5 15 which investment will be worth more at the end of the investment period?

To solve this we are going to use the simple interest formula: 
where
is the final amount.
is the initial investment. 
is the interest rate in decimal form.
is the time in years. 

Investment A. We know that the initial investment is $10,000, so . We also know that the number of years is 5, so . To convert the interest rate to decimal form, we are going to divide the rate by 100%

Lets replace those values in our formula to find :




Investment B. , , and .




We can conclude that investment A will be worth than investment B at the end of the investment period.