If it is very difficult to set the unknown X series equation directly, we can introduce the auxiliary unknown original purchase price m, then 0.92M is the discount price, and x% is the profit rate, expressed as a percentage. Then write the equation of selling price (fixed), and we can get: m (1+x%) = 0.92m [1+(x+).

My answer is:

Solution: Let the original profit rate of goods be X and the original purchase price be M, then 0.92M is the discount price, and X is the profit rate, expressed as a percentage, and then write the equation of selling price (fixed).

Available: m (1+x%) = 0.92m [1+(x+10)%].

Rounded to m:1+x% = 0.92 [1+(x+10)%].

Solution: x= 15

A: The original profit rate of this commodity was 15%.