如何计算Discount
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A discount calculator computes the sale price after applying a percentage discount, the discount amount, or the original price from a sale price and discount percentage. Essential for retail pricing, coupon calculations, and negotiation.
分步指南
- 1Sale price = Original price × (1 − discount%)
- 2Discount amount = Original price × discount%
- 3Original price = Sale price / (1 − discount%)
- 4Successive discounts are NOT additive: 20% + 30% off ≠ 50% off
例题解析
输入
$120 item, 25% off
结果
$90 sale price, $30 saved
$120 × 0.75 = $90
输入
Two successive discounts: 20% then 30%
结果
Effective discount = 44%
0.80 × 0.70 = 0.56 → 44% off, not 50%
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