A credit card company has a cash back option for their customers which is based on the annual amount that they charge on their credit cards. The customer receives 1.5% cash on their first $5000 of purchase, 2.5% on the next $5000 of purchase and a 3% on cash back on portion that exceeds $10,000. If a customer receives a cash back of 2.5% on their total annual charges made on the credit card, then what was the customer's annual charge?
Choose the correct answer:  A) $17,500  B) $20,000  C) $22,500  D) $25,000  E) $27,500
The customer receives $75 for the first $5000.   The customer receives $125 for the next $5000.   Let x be the total amount of the customer's annual charge.   $200 + 0.03(x-10,000)=0.025x   0.005x=100   x=20,000   The answer is $20,000.
<result>B</result>
A credit card company has a cash back option for their customers which is based on the annual amount that they charge on their credit cards. The customer receives 1.5% cash on their first $5000 of purchase, 2.5% on the next $5000 of purchase and a 3% on cash back on portion that exceeds $10,000. If a customer receives a cash back of 2.5% on their total annual charges made on the credit card, then what was the customer's annual charge?