## What is the formula for original price?

Calculating Original Price From Discounted Price

100 percent minus 20 percent is 80 percent, or 0.8.

Expressed as an algebraic equation, $400 = 0.8(Y), where Y is the original price.

Divide each side by 0.8 to solve for Y.

$400 divided by 0.8 equals $500, which is the original price.

## How do you find the original price after a percentage increase?

Finding the original number after a percentage change . –

## What was the original price of an item if a discount of 20 percent reduced the price to Rs 100?

If a discount of 20 percent reduces the price of the item to Rs. 100 then the original price of an item was Rs. 125.

## How do you find the sale price?

**Procedure:**

- To calculate the discount, multiply the rate by the original price.
- To calculate the sale price, subtract the discount from original price.

## How do you find the reverse percentage?

Step 1) Get the percentage of the original number. If the percentage is an increase then add it to 100, if it is a decrease then subtract it from 100. Step 2) Divide the percentage by 100 to convert it to a decimal. Step 3) Divide the final number by the decimal to get back to the original number.

## How do you add 10% to a price?

**There are two steps to calculating a 10 percent discount:**

- Step 1 is to convert your percentage to a decimal, the formula for which is 10 / 100 = 0.1. So 10 percent as a decimal is 0.1.
- Step 2 is to multiply your original price by your decimal.

## How do you find the unknown amount when given the percentage?

To determine totals from a percent in the future, multiply the given percentage value by 100 and divide that product by the percent. This method works in any instance where a percentage and its value are given. For example, when 2 percent = 80, multiply 80 by 100 and divide by 2 to reach 4000.

## How do you find the percent of a number?

**1. How to calculate percentage of a number. Use the percentage formula: P% * X = Y**

- Convert the problem to an equation using the percentage formula: P% * X = Y.
- P is 10%, X is 150, so the equation is 10% * 150 = Y.
- Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10.