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Ratios, Percentages, and Proportions Videos 55 videos
SAT Math 10.3 Geometry and Measurement. What is the ratio of birds to dogs?
SAT Math 2.1 Statistics and Probability. Which two items have the highest protein to fat ratio?
SAT Math 2.2 Statistics and Probability. What percent of her recommended daily intake of 2000 calories did she consume?
SAT Math 5.4 Numbers and Operations 210 Views
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SAT Math 5.4 Numbers and Operations
Transcript
- 00:02
Here’s your shmoop du jour, brought to you by Sweaters.
- 00:06
A word of warning: don’t ever wear them while herding sheep.
- 00:12
A sweater is on sale for 25% off the original price. Beth has a coupon for an additional
- 00:17
10% off the sale price. What is the total discount (as a percent)?
- 00:23
Okay, so even though this problem doesn’t give us the original price of the sweater,
Full Transcript
- 00:27
we have enough information to find the answer.
- 00:29
25% off means that Beth is paying 75% of the original price.
- 00:35
10% off the sale price means that Beth is paying 90% of that 75% of the original price.
- 00:42
All we have to do is multiply the decimal forms of those percents.
- 00:46
And we get 0.9 times 0.75 is 0.675. Or 67.5% of the original price.
- 00:54
The original price is 100%.
- 00:57
So we can subtract 100% by the percentage Beth is actually paying 67.5%...
- 01:02
to get the percent discount.
- 01:04
Got that? 100% - 67.5% equals 32.5%...
- 01:10
So the percent discount is 32.5% and we're done.
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