为了奖励积极参加数学课外活动的同学,班级准备了丰富的奖品.1.2元的奖品买了24份,2.5元的奖品买了16份.

1个回答

  • (1)1.2×24+2.5×16,

    =28.2+40,

    =68.2(元);

    答:买这两种奖品一共花去68.2元钱.

    (2)100-68.2,

    =31.2(元);

    答:应找回31.2元钱.