Question

The selling price of 40 books is equal to the cost price of 50 books. Find the gain or loss percent.

Answer 1

Answer:

If cost price of ... price of 20 books , calculate the gain or loss percent.

Answer 2

Answer:

Selling price of 40 books is equal to the cost price of 50 books. Find the gain or loss percent.

But without the cost price or atleast the selling price I can't solve it....