Store a and store B sell the same goods at the same price, and each of them offers different preferential schemes: after purchasing 100 yuan goods in store a, 90% of the original price will be charged for the goods they buy again; after purchasing 50 yuan goods in store B, 95% of the original price will be charged for the goods they buy again. How can customers choose a store to get more preferential treatment? 1) When the cumulative purchase is more than 100 yuan but less than 150 yuan, which store will spend less? 2) When the cumulative shopping is just 150 yuan, which store will cost less?

Store a and store B sell the same goods at the same price, and each of them offers different preferential schemes: after purchasing 100 yuan goods in store a, 90% of the original price will be charged for the goods they buy again; after purchasing 50 yuan goods in store B, 95% of the original price will be charged for the goods they buy again. How can customers choose a store to get more preferential treatment? 1) When the cumulative purchase is more than 100 yuan but less than 150 yuan, which store will spend less? 2) When the cumulative shopping is just 150 yuan, which store will cost less?

1),
Let the total price be 100 + X, X

If the cost of a commodity is reduced by 10%, its profit margin will be increased by 15%, and the profit rate of the commodity will be calculated

15%=3/20
Let cost be X
x-10%x=3/20*10%x
The solution is: x = 35%
Good luck. Goodbye
Why not solve it

How to solve the equation x + 5x-15 = 15

x＋5x－15=15
6x－15=15
6x=15＋15
6x=30
x=5

4-5x = 3 × 15 / 2,

-5x=22.5-1.4 -5x=21.1 x=-4.22