Rubin has 6 rolls of pennies containing 50 coins each, 5 rolls of nickels
 containing 40 coins each, 4 rolls of dimes containing 50 coins each, and 3
 rolls of quarters containing 40 coins each. How much money does he have?
 A. $17.50
 B. $8.20
 • C. $63.00
 D. $68.40