35.40
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The shoes will cost 21.
28
A 40% discount off of a price of 35 = 21 as the new price (60% of 35)
Discount #1 = 40% Discount #2 = (100% - 40%) X 30% = 18% Discount #3 = (100% - 40% - 18%) X 10% = 4.2% Total discount off the original price = 40% + 18% + 4.2% = 62.2%
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.