Question 600810: if a discount of 25% off the retail price of a desk saves mark $45, how much did he pay for the desk?
Answer by Rcmathtutor(12)   (Show Source):
You can put this solution on YOUR website! We may solve this problem by using proportions.
The reasoning would go like this: Let X be the original price of the desk. Since the discount was 25%, it means $25 saved per every $100. So, if Mark saved $25 per $100, he saved $45 for how much? Or 25 per 100, 45 per X. The proportion goes:
X = 180
The price of the desk, before the discount, was $180.
Since Mark got 25% discount, or $45, he paid 180 - 45, or $135.
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