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% cash on their first $5000 of purchase, 2% 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 most appropriate option.
A) $24,000	B) $26,000	C) $28,000	D) $30,000	E) $32,000
The customer receives $50 for the first $5000.   The customer receives $100 for the next $5000.   Let x be the total amount of the customer's annual charge.   $150 + 0.03(x-10,000)=0.025x   0.005x=150   x=30,000   The answer is $30,000.
<result>D</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% cash on their first $5000 of purchase, 2% 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?