How much is the original price of a commodity if it is first increased by one ninth and then decreased by one ninth

How much is the original price of a commodity if it is first increased by one ninth and then decreased by one ninth

What's the price before you cut it by one ninth
160 ÷ (1-1 / 9) = 180 (yuan)
What is the original price
180 (1 + 1 / 9) = 162 (yuan)