week-5_ratios, proportions, and percent. a b r solving percentage problems guide
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Week-5_Ratios, Proportions, and Percent
Week-5_Ratios, Proportions, and Percent
Week-5_Ratios, Proportions, and Percent
AB R
Solving percentage problems guide
Week-5_Ratios, Proportions, and Percent
AB R
• What is 20% of 60?• 12 is what
percent of 60?• 12 is 20% of
what number?
Week-5_Ratios, Proportions, and Percent
AB R
A = B x R% B = A / R% R = A/B x 100
Week-5_Ratios, Proportions, and Percent
AB R
A = B x R%
What is 25% of 300?Example:
A = B x R%A = 300 x 25% = 75
Week-5_Ratios, Proportions, and Percent
AB R
B = A / R% 60 is 75% of what number?Example:
B = A / R%B = 60/75% = 80
Week-5_Ratios, Proportions, and Percent
AB R
B = A / R% 60 is 75% of what number?Example:
B = A / R%B = 60/75% = 80
Week-5_Ratios, Proportions, and Percent
AB R
R = A/B x 100
120 is what percent of 600?Example:
R = A/B x 100
R = 120/600 x 100
R = 20%
Week-5_Ratios, Proportions, and Percent
AB R
A = B x R% - Amount of discount- Amount of increase- Amount of decrease- Amount of tax
Week-5_Ratios, Proportions, and Percent
A = B x R% A file that is 287 megabytes is being downloaded. If the download is 13.3% complete, how many megabytes have been downloaded? Round your answer to the nearest tenth.
A = B x R% 287x 0.133 = 38.171= 38.2
Week-5_Ratios, Proportions, and Percent
AB R
R = A/B x 100
- Rate/Percent of discount- Rate/Percent of increase- Rate/Percent of decrease- Rate/Percent of tax
Week-5_Ratios, Proportions, and Percent
R = A/B x 100
A salesperson earns a commission of $ 624 for selling $3900 in merchandise. Find the commission rate. Write your answer as percentage.
R = A/Bx100 R = 624/3900x100 = 16%
Week-5_Ratios, Proportions, and Percent
B = A/RToday, the sofa is being sold at a 74% discount. The sale price is Dh254.80. What was the price yesterday?
B = N/1-R 254.80/1-0.74 = Dh980
N1±RB=