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I know that dinosaurs died out in 65 million years and lived on earth for 160 million years
The mystery of dinosaur extinction
We human beings have lived on the earth for two or three million years. This period of history is not short. However, compared with the survival years of dinosaurs, it is only a moment
It used to be 6500 yuan per piece. For some reason, the price was increased by 20% and then decreased by 20%. How much is it now?
6500×（1+20%）×（1-20%）
=7800×0.8
=6240 yuan
A commodity used to cost 6500 yuan per piece. For some reason, it was increased by 20% and then decreased by 20%. How much is it now?
Let X
x/(1+20%)(1-20%)=6500
x/96%=6500
x=6240
Which is x
Answer the current price
Can you make the formula more detailed?
After price increase: 6500 * (1 + 20%) = 7800
After price reduction: 7800 * (1-20%) = 6240 (current)
It's awesome. Your answer perfectly solves my problem.
A commodity used to cost 2000 yuan per piece. For some reason, the price was increased by 20% and then decreased by 20%. How much is it now?
I know the answer, but I don't know the formula. The 20% increase is 2400, and the 20% decrease is 20% of 2400. That's 1920
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