math
posted by leslie .
a store charges $28 for a sweater.this price is 40% more than the amount it costs the store.during a sale, store employees can purchase it at 30% off the stores cost. how much will it cost an employee to buy the sweater?

28(.30)
$8.40 is the discount and you subtract this from $28
so, it will cost the employee $19.60. 
the 28 represents 140% of the store cost
so the store cost = 28/1.4 = $20
(check: take 40% of 20, then added to 20 gives 28)
now 30% OFF the store cost means the cost would be 70% of the 20 or $14.00
long way: take 30% of 20, then subtract it from 20
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