2)到书店order book, 如果order less than 15刀,则charge是3刀;如果order more than 15刀,则charge 是20%的order价钱。问X和Y同时order的话,charge是多少 1) the sum of order X and order Y is 18.5 2) the each book of X or Y is no less than 4$
2)到书店order book, 如果order less than 15刀,则charge是3刀;如果order more than 15刀,则charge 是20%的order价钱。问X和Y同时order的话,charge是多少 1) the sum of order X and order Y is 18.5 2) the each book of X or Y is no less than 4$