If the cost of a commodity is reduced by 8% and the retail price remains unchanged, the profit margin will increase from the current M% to (M + 10)% Here's my calculation: Let the cost be X m%x=(m+10)%-92%x The result is m = 115 The other answers are m = 15. I want to know what's wrong with my problem-solving process. (my idea is basically: retail price remains unchanged. Cost * profit margin = retail price). I wonder where to reduce 100%?

m%x=(m+10)%-（100%+92%x）
The result is m = 15

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