Applications of Percents

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Presentation transcript:

Applications of Percents By Mrs. Muller

Key Vocabulary Percent: A ratio that compares a number to 100 Proportion: An equation stating that two ratios are equal. Cross Product: Multiplying the numerator of each ratio with the denominator of the other ratio. Markup: the amount of increase in price. Selling Price: mark up is added to the store’s cost for item; the price the store charges. Discount: the difference between the original price and the sale price of an item.

Key Proportions Amount of Markup Percent of Markup 100 Original Cost Amount of Discount Percent of Discount 100 Original Cost

Finding a Percent of Markup Procedure First step find the amount of markup by finding the difference between the two prices. Second step write a proportion. Let M=percent of markup. Third step write the cross products. Fourth step use the division property of equality in order to isolate the variable. Fifth Step Simplify.

Example of finding a percent of Markup An electronic store orders sets of walkie-talkies for $14.85 each. The store sells each set for $19.90. What is the percent of markup?

Finding a Percent of Discount Procedure First find the amount of discount. Second write a proportion. Let d be the percent of discount. Third step write the cross products . Fourth Step simplify by multiplying the numbers together. Fifth Step use the division property of equality to isolate the variable. Sixth and final step, simplify.

Example of Finding a Percent of Discount During a clearance sale, a keyboard that normally sells for $49.99 is discounted to $34.99. What is the percent of discount?

Procedure for Finding a Sale Price First write the percent as a decimal Second step Multiply Or you can do it as a proportion

Example Finding a Sale Price The tablet Alexis wants cost $156.99 if it is on sale for 30% off, how much does it cost now?