[GMAT官方答疑]GMAT数学题：The regular price ...
The regular price per can of a certain brand of soda is $0.40. If the regular price per can is discounted 15 percent when the soda is purchased in 24-can cases, what is the price of 72 cans of this brand of soda purchased in 24-can cases?
Answer Choices:
* $16.32
* $18.00
* $21.60
* $24.48
* $28.80
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