Sale Price of a $50 item after a 80% Discount is applied

80% Converted to a Decimal: 80% = 0.8
Price After Discount = Price Before Discount * (1 – Discount)
Price After Discount = 50 * (1 – 0.8)
Price After Discount = 50 * 0.2
Price After Discount = $10.00
Sale Price of a $50 item after a 80% Discount is applied = $10.00
Note: Reduction in Price After Discount = $40.00