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XxWellesleyxX
I believe the price for one box with the coupon will be $3.15. This is because 4.50 * .30 = 1.35
4.50 - 1.35 = 3.15 Thus the discounted price will be $3.15
lillylarry
$3.15  you just take 0.3 times 4.5 and then subtract that sum be the original pice  0.3*4.5-4.5
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