Percentage Discount given an Original Price of $120 and a Sale Price of $84

Discount Rate = 1 –  
Discount Rate = 1 – 0.7
Discount Rate = 0.3
0.3 Converted to a Percent: 0.3 = 30%
Percentage Discount given an Original Price of $120 and a Sale Price of $84 = 30%
Note: Reduction in Price = $120 – $84 = $36