- Percentage Increase & Decrease
- 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 final amount given the original amount and a percentage increase or decrease
In this lesson, we learn how to find a final amount, given an original amount and a percentage increase or decrease. The percentage increase may be a markup or profit or just increase in price. Similarly, the percentage decrease may be markdown or discount or loss.
Rules to find the final amount given the original amount and a percentage increase or decrease.
First consider the original amount.
Then consider the rate or percentage increase or decrease
To find the markup or discount, multiply the rate by the original amount.
To find the final amount, add or subtract the markup or discount from original amount.
The next model of a sports car will cost 6% more than the current model. The current model costs $4,000. How much will the price increase in dollars? What will be the price of the next model?
Current model price = $40,000
Percentage increase in price = 6%;
Price increase in dollars = 6% of $40,000 = 0.06 × 4000 = $2400
Next model price = current model price + increase in price
= $40,000 + $2,400
A store was selling lawn chairs at a unit price of $48. The store further offered a 15% markdown on the price of the chair. How much would a chair now cost?
Price of lawn chair = $48
Markdown = 15% of $48 = 0.15 × 48 = $7.20
Price after discount = $48 – $7.20 = $40.80
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