After purchasing two copies of the same book, X sold them respectively at 0.8 and 1.4 times their cost prices. What was the percentage gain earned or loss incurred by X?Question 3Answera.10% lossb.5% gainc.10% gaind.5% loss

Let's assume the cost price of each book is $100 (this simplifies the calculation, and the percentage result will be the same no matter the initial price).

1. The first book was sold at 0.8 times its cost price, which means it was sold for $80. This represents a loss of$20.

2. The second book was sold at 1.4 times its cost price, which means it was sold for $140. This represents a gain of$40.

The total cost price for the two books was $200 ($100 + $100), and the total selling price for the two books was$220 ($80 +$140).

Therefore, X made a total gain of $20 ($220 - $200) on the original cost of$200.

To find the percentage gain, we divide the gain by the cost price and multiply by 100:

($20 /$200) * 100 = 10%

So, X made a 10% gain on the sale of the two books. The correct answer is (c) 10% gain.