[計量] A telephone company offers a ...
A telephone company offers a special service to customers who
make long-distance calls. For an additional monthly charge of
$8, all long-distance charges in excess of $16 for a month are
reduced by 50 percent. If a customer has long-distance charges
of $48 for one month without the special service, how much would
the customer have served by using the special service?
(A)$0 (B)$8 (C)$16 (D)$20 (E)$32
Ans:(B)
我算不出來是(B),麻煩各位幫我解答一下,感謝
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