材料:W:Well,canyouconfirmthatweorderednineboxesofpaperforthephotocopier?
M:No,youorderedtenboxesofpaperat$9each.
W:Ok,Here'sthemoney.
Howmuchshouldthewomenpay?
A.$72B.$81C.$90
我觉得选C,可是答案给了A,