A customer pays 70 dollars for a coffee maker after a discount of 20 dollars
What is the original price of the coffe maker?
Select the correct option
A) 50  B) 40  C) 90  D) 60  E) 20

Rationale: let x be the original price . x - 20 = 70 x - 20 + 20 = 70 + 20 x + 0 = 90 x = 90 answer is c
Answer: C