5 exercises · 5 automatically checked · Untimed
5 questions · Shuffled order · Untimed practice
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An item costs $96.30 after a 7% sales tax is added. What was its pre-tax price, in dollars?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
Answer: 90
If P is the pre-tax price, then 1.07P
Review worked example 2.03.
A quantity rises from 250 to 400. What is its percent increase?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
Answer: 60
The increase is 400 − 250
Review worked example 2.04.
A participation rate rises from 32% to 40%. What is the relative percent increase in the rate?
Answer: C: 25%
The change is 8 percentage points. Relative to the original rate, it is 8/32
Review worked example 2.05.
A value decreases by 20%. By what percentage must the reduced value increase to return to the original value?
Enter an integer, decimal or fraction without units. Use up to 5 characters, or 6 including a leading minus.
Answer: 25
Use an original value of 100. After the decrease it is 80. Returning to 100 requires a gain of 20 relative to 80, or (20/80)(100)
Review worked example 2.10.
A product’s price decreases by 10%, while the number sold increases by 20%. What is the percent increase in revenue?
Answer: A: 8%
Revenue is price times quantity. Its multiplier is 0.90(1.20)
Review worked example 2.15.