Answer:
p = $150
Step-by-step explanation:
Let p represent the original price. Â Then 10% of that is the discount: Â 0.10p.
The price after discount is 90% of the original price, or (1.00-0.10)p = 0.90p = $135. Â We next solve this equation for p: Â 0.90p = $135, or p = $150.