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### Course: Digital SAT Math>Unit 7

Lesson 3: Percentages: medium

# Percents — Basic example

Watch Sal work through a basic Percents problem.

## Want to join the conversation?

• , how did he end up with 20%? I don't understand why its 20%
• the total was 100 %
but , 22.40/28 = 0.8 or 80%
we paid only 80% of it , so 100 - 80 = 20 %
hope you get it ! :)
• As per Sal's percentage based solution, the answer should be 12.5 bcoz, when he ate 1st bowl, what was left was 92%, and after that he kept consuming 8% every time. so, here 92/8 = 11.5 ( correct ), but now we also have to add the 1st bowl which he ate. which makes (11.5 + 1) = 12.5. This is what I think. If anyone can spot any error in my judgment, please let me know.
• I literally did the same thing, but my guess is, the question says "expect" to eat. so I'm guessing they want an answer excluding the first bowl he already had
• if you have questions like this how do you know if you should answer the question using these steps if there are questions worded or phrased differently
• The best way you can identify a problem like this is if it assumes the starting point is 100%. Like Sal had said, if you are starting from a whole and consistently subtracting the same amount every time, you don't even need to think about the percentages, you can just substitute them as units.
• its easy... In India they teach a very simple method
here the porblem could be solved under 2 mind steps
• Can you show the method?? please
• Im having a quiz tomorrow on Ratios, Rates, Proportions, Percents and Units. Which one should i study first?
• Everything because you don't want to fail.
• why did he multiplied with 0.7
• Hello Sebnem,

The discount was 30% but we still need to pay the other 70%.

Sal does the same thing again when we pay 80% at the counter. Therefore the additional discount was 20%.

Regards,

APD
• At why does Sal divide 22.40 by 28?
• Sal divides 22.40 by 28 to figure out what percent of the already discounted price was paid.

With that information, he could find out what the additional discount was.
• Please, why can't I replay the video after watching?
• I'm not sure. Perhaps you ought to try reloading the page?
(1 vote)
• This was extremely simple.
100/8=12.5
12.5 Bowls-1 Bowl= 11.5 Bowls