Algebra Percent Problems.

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Presentation transcript:

Algebra Percent Problems

Review Write as a fraction in simplest form. 74% = = 74/100 = 37/50 2.6% = = 2.6/100 = 26/1000 = 13/500

15% of 180 is what number? There is a great formula that can help us solve all of these percent questions. part = % whole 100 The next formula states the same relationship. is = % of 100

15% of 180 is what number? is = % Set up the proportion. of 100 x = 15 Simplify if possible(only up and down). 180 100 x = 3 Cross multiply. Different than cross cancel. 180 20 I cans how you a shortcut here! 20x = 540 Solve. x = 27 15% of 180 is 27!

What percent of 225 is 99? is = % Set up the proportion. of 100 99 = x Simplify if possible(only up and down). 225 100 11 = x Cross multiply. Different than cross cancel. 25 100 25x = 1100 Solve. x = 44 44% of 225 is 99!

See if you can do it! 30 is what percent of 75? Answer: 30 is 40% of 75. 4.8% of 125 is what number? Answer: 48% of 125 is 6.

If the original price of an item is $54 and it is discounted 20%, what is the sale price? part = % In order to find the sale price, we must find whole 100 the discount, which is the part. x = 20 Simplify if possible(only up and down). 54 100 x = 1 Cross multiply. Different than cross cancel. 54 5 5x = 54 Solve. x = 10.80 The discount, x, is $10.80! The sale price is $54.00 - $10.80 = $43.20

x = 3 Cross multiply. Different than cross cancel. 480 20 Ron makes 15% commission on each pair of shoes he sells. How much commission does he make if he sold $480 worth of shoes? part = % In order to commission, we must find whole 100 the part. x = 15 Simplify if possible(only up and down). 480 100 x = 3 Cross multiply. Different than cross cancel. 480 20 20x = 1440 Solve. x = 72 Ron made $72.

HW #1-16, #25-36