    ѧԱ⣺֪һӵȵصĸ۸ʽÿǧ0.8Ԫ׷Ͷ100ԪĲΪ300ǧˣƽΪ25%׷ͶʲľԵ()μ?

ʦظũҵʱлɵƽʱлɣʹũƷܹոɱĲƷֵг۸ۣӦĳ󡣼ũƷ۸۸׷Ͷʵĸɱ100/300=0.3Ԫ/ǧ Ʒ󣺸۸-ɱ0.8-0.3=0.5; ׷Ͷʵ0.5300=150 ׷Ͷʵʣ150-100/100=50%ʣ50%-25%=25%100(1+25%)=125Ԫ

