How much is the current price of a commodity after a tenth price reduction and then a tenth price increase
(1-1/10)×(1+1/10)
=9/10×11/10
=99/100
The price of a commodity first increases by 10% and then decreases by 10%. The current price is 9.9 yuan. How much is the original price?
9 △ 1-1 / 10) △ 1 + 1 / 10 = 9.9 △ 9 / 10 △ 11 / 10 = 11 △ 11 / 10 = 10 yuan
The original price of a commodity is 600 yuan. The first price cut is one tenth, and the second price cut is one tenth. How much is the current price?
The first drop is one tenth = 600-600 * 0.1 = 540;
The second drop of one tenth = 540-540 * 0.1 = 486
A: the current price is 486 yuan