Percent of Change

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Percent of Change

Algebra

After watching the Yay Math video on this concept, take this quiz to see how much you've learned! See the results right when you're done, AND, there's even an option to send the results to an email of your choice. Good luck, no pressure, and YAY MATH!

Would you like to share this quiz with others who experience a 100% change of life's joy whenever they think of math? Here's the shortened link, for you to add to their joy: https://forms.gle/9uioBqFzfXNbbo6y5

What's your name? *

Email send?

(If you want your score automatically sent to you or to someone else, which email would you like to use? This is optional and for your convenience; everything is kept private.)

What is an informal calculation of percent of change? *

1 point

difference / original

original / difference

new amount / original amount

1 – difference / new amount

If a number grows from 30 to 36, what is the percent of increase? *

1 point

20 %

30 %

25 %

15 %

6 %

If a number diminishes from 30 to 15, what is the percent of decrease? *

1 point

15 %

30 %

50 %

100 %

That depends on what your definition of the word "is" is.

Suppose an item costs $56. The sales tax is 5%. What would be the total cost of the item, including the tax? *

(Hint: if you can get 10% of $56, then you can get 5% of $56.)

1 point

$56.05

$60.30

$58.80

$61

$56.50

Back in the day, I used to work as a grocery store cashier. Employees got a 15% discount on their groceries. So if my total at check-out BEFORE the discount was $71, what would my cost be AFTER the discount? *

(True story: one day on the job, 8 other cashiers were fired, all on the same day, for giving their friends discounts way more than 15%. Not THIS guy though; I was as clean as a whistle. I wish I had asked for a raise at that point. I just didn't think to.)

1 point

$59.45

$58.75

$56

$61.10

$60.35

An increase of 100% to a number is the same as multiplying that number by: *

1 point

An DECREASE of 100% to a number is the same as multiplying that number by: *

(Hint: how much of a number is left if you decrease the number by 100%?)

1 point

If a number grows from 11 to 25, what is the percent of increase? *

(Please round your answer to the nearest percent.)

1 point

133 %

87 %

25 %

113 %

127 %

An increase of 200% to a number is the same as multiplying that number by: *

1 point

The shopper's dilemma: do we save money by applying a discount first, then the sales tax? Or the other way around: by first adding the sales tax, then applying a discount? Suggestion: suppose an item costs $100. You have a coupon for 10% off, and you know that sales tax is an additional 10%. Try taking the discount off, then adding the tax, and note that total. Then, do it the other way around: add the tax, then apply the discount, to get a new total. Does a specific order save us money, and if so, what is the most cost effective order? *

(Hint: once you add 10% to the total, 10% of that new amount is NOT $10 any more.)

1 point

We save more by applying the discount first, then adding the sales tax.

We save more by adding the sales tax first, then applying the discount.

The order of applying the discount and adding the tax is irrelevant. The final price will be the same either way.

Just steal it. (KIDDING, please refer to the cashier story above.)

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