- Percentage Increase & Decrease
- Home
- Finding the final amount given the original amount and a percentage increase or decrease
- Finding the sale price given the original price and percent discount
- Finding the sale price without a calculator given the original price and percent discount
- Finding the total cost including tax or markup
- Finding the original amount given the result of a percentage increase or decrease
- Finding the original price given the sale price and percent discount
- Comparing discounts
Finding the total cost including tax or markup
In this lesson, we learn how to find the total amount, given an original amount and a tax or markup. The rate of markup or rate of tax is usually a percent.
Rules to find the total cost given the original amount and a tax or markup rate.
First consider the original amount.
Then consider the rate of tax or markup
To find the tax or markup, multiply the rate by the original amount.
To find the total cost, add the tax or markup to the original amount.
A laptop has a listed price of $790 before tax. If the sales tax rate is 6.5% find the total cost of the laptop with sales tax included. Round your answer to the nearest cent as necessary.
Solution
Step 1:
List price of the laptop = $790
Sales tax rate = 6.5%
Step 2:
Sales tax = 6.5% of $790 = 0.065 × 790 = $51.35
Step 3:
Total cost of laptop including sale tax = list price + sales tax
= $790 + $51.35
= $841.35
A store bought a carton of apples for $85 and sold them at a markup of 20%. What price did the store sell the apples?
Solution
Step 1:
Price of apples = $85
Markup rate = 20% of $85
Step 2:
Markup = 20% of $85 = 0.2 × 85 = $17.0
Step 3:
Total cost of apples including markup = $85 + $17 = $102