单项选择题
A.以客票价10%收取退票费 B.以客票价20%收取退票费 C.免收退票费 D.收取客票价50%退票费
A.-2537 B.4058 C.16931 D.4378
A.4957.11 B.6434.64 C.320,000.00 D.3927.58