一种商品,先降价30%后,又提价30%,现价是原价的( ) A.91% B.100% C.109
一种商品,先降价30%后,又提价30%,现价是原价的( ) A.91% B.100% C.109
日期:2021-05-02 09:59:48 人气:1
设原价是1,则: 1×(1-30%)=0.7; 0.7×(1+30%) =0.7×130%, =0.91; 0.91÷1=91%; 答:现价是原价的91%. 故选:A. |
一种商品,先降价30%后,又提价30%,现价是原价的( ) A.91% B.100% C.109
设原价是1,则: 1×(1-30%)=0.7; 0.7×(1+30%) =0.7×130%, =0.91; 0.91÷1=91%; 答:现价是原价的91%. 故选:A. |