Answer to Question #10368 in Other Math for shelley rivera
Let x be the original cost. Then
is the amount the student pays (100%-10% = 90%) and
is the sales price (100%-15%=85%). If the sales price = 306, then
0.85·0.90x = 306
So, the original cost was $400.
This makes sense because $40 was taken off for the student discount, bringing the sales price to $360 and an additional 15% of 360 = $54, so $360-$54 = $306.
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