gwd 2 9 百分比表示法 困惑

Kath1985

Q9:

What was the price at which a merchant sold a certain appliance?

(1)The merchant’s gross profit on the appliance was 20 percent of the price at which the merchant sold the appliance.

(2)The price at which the merchant sold the appliance was $50 more than the merchant’s cost of the appliance.
答案C 請問 黃色部分是指 profit=0.2 sold price 嗎?
如何用這兩個條件求得sold price呢?

shevit

the price( at which the merchant sold the appliance)=gross profit+cost
so $50=gross profit.
then 50=gross profit=0.2*sold price
so u can get the sold price

zbubaobao

答案是C喽~.
gross profit是毛利润的意思，就是P-C，本题设price=p
所以：从（1）推出：p=20%p=P-C

          从（2）推出： P=50+C
由（1）得：C=80%p, 带入（2）中得，P=50+80%P,
解出p=250
 所以选C。