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The selling price of a commodity is 150 yuan, and the profit of a commodity sold by the merchant is 10% ~ 20% of the purchase price. What is the range of the purchase price (accurate to 1 yuan) The inequality I listed is that x + x times 10% is less than or equal to 150 I write the second inequality separately. X + x times 20% is greater than or equal to 150 They form a system of inequalities
1 + 10% = 110% 150 divided by 110% is about 136 1 + 20% = 120% 150 divided by 120% = 125 the price range is 136 ~ 125
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