Mathematics problem: a commodity, now 10% price increase, and then 10% price reduction is 100 yuan, excuse me, how much is this commodity?

Mathematics problem: a commodity, now 10% price increase, and then 10% price reduction is 100 yuan, excuse me, how much is this commodity?

Let X be
x*（1+10%）*（1-10%）=100
x*1.1*0.9=100
X = 100 / 0.99 = 101.01 yuan

For a product priced at 75 yuan, the price was reduced by 20% at first, and then increased by 20%. How much is the current price of this product?

Now the price of this product is (1-20%) of the original price x (1-20%) = 96%

The original price of a certain commodity is 100 yuan. After 10% price increase, the price will be reduced by 10%. How much is the current price?

The original price is 100 yuan. After 10% increase, the price is: 100 (1 + 10%) = 110 yuan. On the basis of 110 yuan, the price will be reduced by 10%. The current price is: 110 (1-10%) = 110 × 90% = 99 yuan. Answer: the current price is 99 yuan