A farmer is growing corn. For every 4 seeds he plants, he gets one ear of corn, that he can sell for $.1. It costs $.5 for a bag with 100 seeds. If he makes $40 in profit, how many ears did he sell?
Reason slowly and give your answer.
500
A single seed costs $.

005 because.

5 / 100 =.

005.

It costs $.

02 cents to grow an ear of corn because.

005 x 4 =.

02.

On each ear of corn he makes $.

098 profit because.

1 -.

02 =.

08.

He sold 500 ears because 40 /.

08 = 500.

.

The answer: 500