3. Ben and David go to buy bagels. For every 1 yuan Ben spends, David can save 25 fen. This way, Ben spends 12.50 yuan more than David. Then the total amount spent by both is ( ) yuan.
(A) 37.50
(B) 50.00
( C) 87.50
(D) 90.00
(E) 92.50
3. C.

From the information that Ben spent 12.50 yuan more than David, we know Ben spent $12.50 \div 0.25=50.00$ yuan, and David spent $50.00-12.50=37.50$ yuan. Therefore, $50.00+37.50=87.50$ yuan.