Question 600810
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:
{{{25/100 = 45/X}} Cross multiply:
25X = 4500 Divide both sides by 25: {{{X = 4500/25}}}
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.