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7 th Grade Math Ms. Richardson
Before, we answered all types of percent questions using proportions. However, when you are finding the percent of a number, there is a simpler method. 1 st Step Change the percent to a decimal 2 nd Step Multiply the decimal and the number
Find 20% of 40. 1 st Change 20% into a decimal 2 nd Multiply 0.20 x 40= 8 20% of 40 is 8
Find the percent of a number a.) 80% of 55 b) 30% of 90
You can only use this method for finding the percent of a number. If the question asks “8 is 20% of what number?”, you can not use this method. This method is only to find the “is”.
A decrease in the price of an item is a discount. To find the sales price of an item: 1 st Find the amount of the discount 2 nd Subtract the discount from the original price Example You buy a pair of jeans that is 33% off the original price of $29. What is the sale price? 1 st Find the amount of the discount 33% of $29 = 0.33 x 29 = $ 9.57 2 nd Subtract the discount from the original price 29 – 9.57 = 19.43
A store is selling flip-flops at 20% off their original price. What is the sale price of a pair of flip-flops originally priced at $20? Well 20% of $20 =.20 x 20 = 4 bucks So I subtract the discount from the original price
Sales tax and tips are the amounts that are added to the price of purchase. Sales tax and tips are calculated using a percent of the purchase price. Sales tax in Louisiana is 9% Suggested tip is 15% of your purchase at a restaurant.
At a restaurant, you order a meal that costs $12. You leave a 15% tip. The sales tax is 9%. What is the total cost of the meal? 1 st Find the tip 15% of $12 = 0.15 x 12 =$1.80 2 nd Find the tax 9% of $12 = 0.09 x 12 = $1.08 3 rd Add the food 12 + 1.80 + 1.08 = $14.88 bill, tip, and tax Answer: The total cost of the meal is $14.88
Your bill at a restaurant is $28.85. You leave a 20% tip and are charged a 5% sales tax. What is the total cost of the meal?
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