An item that costs $45, when discounted 22 percent, will cost $35.1. The easiest way of calculating discount is, in this case, to multiply the normal price $45 by 22 then divide it by one hundred. So, the discount is equal to $9.9. To calculate the sales price, simply deduct the discount of $9.9 from the original price $45 then get $35.1 as the sales price.