Question

Q11. The cost price of 10 books is equal to the selling price of 8 books, find the gain or loss
percent

Answer 1

Step-by-step explanation:

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567 is the correct answer

Answer 2

Step-by-step explanation:

Given that the cost price of 10 books is equal to the selling price of 8 books.

Let's say the selling price of one book be 10x.

Therefore, the selling price of 8 books = 80x

Similarly, cost price of 10 books = 80x

Now,

Cost price of 1 book = 80x/10 = 8x

So,

Profit = Selling price - Cost price

Profit = 10x - 8x

Profit = 2x

Profit% = (Profit/Cost Price) × 100

Profit % = (2x/8x) × 100

Profit% = 100/4

Profit% = 25%

Therefore, the gain% is 25%.

Method 2)

Cost price of 10 books is equal to the selling price of 8 books.

5 × Cost Price = 4 × Selling Price

If cost price = 4 then sale price = 5

Therefore,

Gain% = (Selling Price - Cost Price)Cost Price × 100

Substitute the values,

= (5 - 4)/4 x 100

= 1/4 x 100

= 25%

Therefore, the gain% is 25%.