Posted by **James** on Thursday, April 12, 2012 at 12:56am.

A grocery store manager must decide whether to buy four rug cleaners to rent to customers. The manager estimates that the first would yield $200 a year, the second $150, the third $75, and the fourth $20. If the interest rate is 12 percent and each rug cleaner costs $500, how many should the manager buy? a. none b. two c. one d. four e. three

The answer is three, but how do I get it?

- Finance -
**Anonymous**, Wednesday, October 23, 2013 at 10:27pm
Popioo

- Finance -
**Dave**, Monday, June 9, 2014 at 6:14pm
I'm thinking it's a function of saving the money in an account that earns the 12% (compounded monthly) over the 4 year period.

$500 saved @ an annual rate of return of 12% (again, compounded monthly) yields $806.11 - or $306.11 of interest, which comes to $76.73 of interest returned per year - $1.73 better than the $75 per year yield on the fourth rug cleaner.

I used a simple savings calculator to help calculate my answer.

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