Mom bought me a coat, which is 15 yuan cheaper than the original price. How much is the original price of this coat?

Let the original price be X
0.85X=X-15
0.85X-X+15=0
X=100

A jacket is sold at a 25% discount. It's 42 yuan cheaper. How much is it after discount?

Set the original price as X Yuan, 0.15x = 42, x = 280, and then 280 * 0.85 = 238 yuan

After a 15% discount, the price of a coat is 510 yuan. If the price is 300 yuan, how much discount is it?

The price of this dress is 600 yuan. After 8.50% discount, it is 510 yuan. After 5% discount, it is 300 yuan. It is sold at half price. The specific calculation method is "510 / 0.85 = 600, 600 × 0.5 = 300". Thank you

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