Percentage Discount given an Original Price of $3,000 and a Sale Price of $2,100

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 $3,000 and a Sale Price of $2,100 = 30%
Note: Reduction in Price = $3,000 – $2,100 = $900