Helps me solve this problem please

Precalculus question, image attached.

Can someone me find the original price? the discount is 5% and the sale price is $68.40

What are the domain and range of the function below? a) domain: (-4,0) range: [-2,infinity) b) domain: (-3,0) range: [-2,infinity) c) domain: (-infinity, infinity) range: [-2, infinity) d) domain: [-2,infinity) range: (-infinity, infinity)