a = variable
b = 40%a a - b = c
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A 40% discount off of a price of 35 = 21 as the new price (60% of 35)
First you calculate 40% of the original price, which is .4 times original price. Then you subtract that number from the original price to get 40% off. For example, if a pair of shoes originally costs $10 but is 40% off, then you would calculate .4 x 10, which is 4, then subtract 4 from 10, which is 6. So 40 percent off of 10 is 6.
600 - 40% = 60% left of 600 = 60*60/100 = 360
-- subtract the percent off from 100 -- divide the sale price by the answer -- multiply that answer by 100, and you have the original price