Carlos wants to make covers for cell phones. He buys a kit for $6.15. He decides to sell the cases for $8.30.

Question

Carlos wants to start selling cell phone covers. He buys at kit for $6.15 and decides that he will sell the phones for $8.30. How many cell phone covers does he need to sell to make a profit of $400?

Answer 1

His profit peer case is $8.30 - $6.15, or $2.15

 

c = number of cases to sell

 

2.15c = 400

c = 186.046512

 

Since a covers are only sold in whole number, he must sell 187.