The usual price of a computer mouse 35 at a computer fair Matthew buys the computer mouse at a discount of 40 percentage what is selling price of the computer mouse at the fair

To find the selling price of the computer mouse at the fair, we need to apply the 40% discount to the usual price of $35.

Discount = 40% of $35 = (40/100) * $35 = $14

Selling price at the fair = Usual price - Discount = $35 - $14 = $21

Therefore, the selling price of the computer mouse at the fair is $21.