If the total price for n copies of a book is $31.5, what is the per copy of the book?

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Source: Princeton Review

If the total price for n copies of a book is $31.5, what is the per copy of the book?

1) If twice as many copies were bought for same total price, the price per copy would be $1.75.
2) If 4 fewer copies were bought for the samt total price, the price per copy would be $2.80 greater.

The OA is D
Source: — Data Sufficiency |