# What is 20% off $40? — Discount Calculator

> 20% off $40 means you pay $32.00 and save $8.00. See the sale price and savings, then add tax or stack a second discount below.

- **Answer:** Pay $32.00 — save $8.00
- **Category:** Lifestyle & Everyday
- **Interactive calculator:** https://youcalc.com/en/lifestyle-everyday/discount/20-percent-off-40/
- **Price:** Free, no sign-up required
- **Full calculator:** [Discount Calculator](https://youcalc.com/en/lifestyle-everyday/discount/)
- **Pre-filled inputs:** `p=40&d1=20`

| Metric | Value |
| --- | --- |
| Original price | $40.00 |
| Discount (20%) | −$8.00 |
| You pay | $32.00 |


## Overview

20% off $40 leaves a sale price of $32.00, a saving of $8.00. Multiply the price by (1 − 0.20): 40 × 0.80 = 32. To estimate a 20% discount in your head, find 10% ($4.00) and double it. Try any price and discount in the calculator below.

## Method

The sale price is the original price multiplied by each discount factor in turn: sale price = original × (1 − d1 ÷ 100) × (1 − d2 ÷ 100). The amount saved equals original minus sale price. The effective discount percentage is (1 − combined multiplier) × 100, which is always less than d1 + d2 when both are positive. Sales tax is then added to the discounted price: final = sale price × (1 + tax ÷ 100). If only one discount is entered the second factor is 1 and drops out of the calculation.

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## Sources

- https://www.mathsisfun.com/percentage.html
- https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-fractions-decimals/cc-7th-percent-word-problems/a/discount-markup-and-commission-word-problems

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Interactive version: https://youcalc.com/en/lifestyle-everyday/discount/20-percent-off-40/ · From YouCalc — https://youcalc.com