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# L16_blanks - Day 18 Lecture 16 PM 0 2 What are used for...

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1 Day 18 Lecture 16 PM What are % used for? Percentages are used for mainly three purposes, the distinctions can be subtle though… note the key words To Describe a Change. Example: “The cost of tuition could increase by 10% each year.” To Describe a proportion. Example: “12.5% of the students are making an A” To make comparisons. Example: “The smoothies I drink cost 8.3 % more this semester than last semester” 2 0

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2 The Link between % more and % of. My Smoothies used to cost \$4.80 in the spring, this summer they cost \$5.28 What % more is this new price? The new price is what percentage of the old price? 3 7 Solving % More or Less In general if your new value, , is P% more/less than your reference value, , then where “+” is used for _______ and “-” is used for ________. Example: “I bought a bottle of tequila on sale for 15% off. YES! If I paid \$23.80 (ignore taxes), what was the original price? 4 7
3 Beware! Of Percentages of Percentages… Example: “If a savings account interested rate dropped from 4% to 3% what is the absolute decrease and the relative decrease ?” Of Averaging Percentages… Example: “A baseball player had a batting average of .200 during the first half of

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L16_blanks - Day 18 Lecture 16 PM 0 2 What are used for...

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