If the price of a commodity increases by 1 / 10 and then decreases by 1 / 11, then the current price () is the original price

If the price of a commodity increases by 1 / 10 and then decreases by 1 / 11, then the current price () is the original price

Current price = (1 + 1 / 10) x (1-1 / 11) = 1
Current price = original price

For a commodity, the original price is increased by 10%, and then the price is reduced by 10%
A. Constant B. increases C. decreases D. cannot be calculated

The current price is: 1 × (1 + 10%) × (1-10%), = 1 × 1.1 × 0.9, = 0.99; because 0.99 < 1, it is reduced

Is it still the original price to raise the price by 1 / 5 and then reduce the price by 2 / 5

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1×（1+1/5）×（1-2/5）
=6/5×3/5
=18/25
Not equal to 1
So, it's not the original price
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There are three ways for a store to sell a commodity: 1. Raise the price by 10% first and then reduce the price by 10%; 2. Lower the price by 10% first and then increase the price by 10%
First raise the price by 20% and then reduce the price by 20%?

Assuming that the original price of the commodity is 100 yuan: according to scheme 1, 100 * (1 + 10%) * (1-10%) = 99 yuan;
According to scheme 2: 100 * (1-10%) * (1 + 10%) = 99 yuan;
According to scheme 3: 100 * (1 + 20%) * (1-20%) = 96 yuan;
It can be seen that: according to scheme 1 and 2, the price adjustment results are the same;
The results of the three schemes are not necessarily the same