折扣百分比★★★★★同型源自真题 2013-02✓ 已校验A sign at the farmers market says, "20% off, today only: quarter-pound bags of dried mango for just $4 per bag." What is the regular price for a full pound of dried mango, in dollars?农贸市场的一则标语写着：“降价 20%，仅限今天：四分之一磅装的芒果干每袋仅需 4 美元。”那么一磅芒果干的原价是多少美元？(A)12.80(B)16(C)19.20(D)20(E)25