Percentage Discount given an Original Price of $100 and a Sale Price of $65

Discount Rate = 1 –  
Discount Rate = 1 – 0.65
Discount Rate = 0.35
0.35 Converted to a Percent: 0.35 = 35%
Percentage Discount given an Original Price of $100 and a Sale Price of $65 = 35%
Note: Reduction in Price = $100 – $65 = $35