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Junior high school mathematics application problems. Thank you.
What does a store need: 40 * 4+(x-4) * 5 = 5x+140.

Purchase requirements of Store B: (40 * 4+5x) * 0.9 = 4.5x+ 144.

When 5x+ 140 = 4.5x+ 144, that is, x = 8, you have to pay the same amount in both stores.

When 5x+ 140

When 5x+ 140 >: 4.5x+ 144, that is, x > at 8 o'clock, it is cost-effective.

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