書包題.......10分

2007-05-20 3:43 pm
書包按定價出售,每個可得利潤50元.如按定價的80%出售10個,與按定價每個減價30元出售12個可得利潤一樣多,每個書包定價多少?

回答 (2)

2007-05-20 4:52 pm
10yx80%=12(y-30)
8y=12y-360
4y=360
y=90
參考: me
2007-05-20 4:03 pm
Let a be the price of school bag
aX80%X10=(a-30)X12
0.8aX10=12a-360
8a=12a-360
360=12a-8a
360=4a
a=90
The price of a school bag is $90


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