Percent of a number, discount and more
Key notes:
Percent(%) means ”rate per 100.”
For example, 75% means ”75 per hundred” or 75 / 100 .
A percent is 1 part out of 100.
1% is equal to 1/100 or 0.01.
Learn with an example
➡️ Which coupon should Edward use to save the most money on a bottle of water originally priced at ₹80? ₹10 any drink 10%OFF
First coupon
- The first coupon’s discount is ₹10.
Second coupon
- “10% off” means saving 10% of the original price. Find 10% of ₹80.
- Write the percentage as a decimal.
- 10% = 0.10
- Multiply the decimal by the original price.
- 0.10₹80=₹8
- The second coupon’s discount is ₹8.
- Compare the coupons
- The first coupon saves ₹10 and the second coupon saves ₹8.
- Edward should use the first coupon to save the most money.
➡️ What is the sale price of a Halloween mask originally priced at ₹4?
₹_______
Find the discount.
The discount is 75% of the original price. Multiply to find 75% of ₹4.
discount = 75% . 4
= 75/100 . 4 Write the percent as a fraction
= 0.75 . 4 Write the percent as a fraction
=3 Simplify
The discount is ₹3. This means the sale price will be ₹3 less than the original price.
Find the sale price.
Subtract the discount from the original price.
sale price = 4 – 3
= 1 Simplify
The sale price is ₹1.
➡️ A store pays ₹50 for a party hat and marks the price up by 50%. What is the new price?
₹_________
Write the percentage as a decimal.
50% = 0.5
Multiply the decimal by the original price. Multiply as you would multiply whole numbers, then write the decimal point in the answer.
Add the mark-up to the original price.
₹25 + ₹50 = ₹75
The new cost after mark-up is ₹75.
Let’s practice! 🖊️
