(1) 7 (2) 25
(1) 5.80 样例1说明:7*0.8+0.2=5.80 (2) 19.20 样例2说明:25中的10收费10*0.8,10收费10*0.75,5收费5*0.7, 一共是8+7.5+3.5+0.2=19.20