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mathematical problem
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Analysis, he said that ten times the illegal income was fined 2700 yuan, so the illegal income was 2700/ 10=270 yuan. Then, he first raised the price by 40%, and then put up a slogan of 20% discount, so it was 1.4*0.8, and the cost was 1, so he got the equation.
Let the original price be x.
(X+40%X)*80%-X* 10=2700
1. 12x-x=270
0. 12x=270
x=2250
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