If the original price is X, then the purchase price is 0.7x. If you want to make a profit of 30%, you must earn 0.7 *1.3x..

Let the price adjustment be y, then 0.8y = 0.7 *1.3xy = 0.7 *1.3x/0.8 =1.1375x.

A: The price adjustment formula is: y= 1. 1375x x is the original price, and y is the adjusted price. For example, the original price 100 is adjusted to 1 13.75, and the profit price of imported goods is guaranteed to be 30% after 20% discount.