ACT Math : ACT Math
Study concepts, example questions & explanations for ACT Math
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Example Questions
Example Question #171 : Arithmetic
A computer originally sold for 
The most common way to do a problem like this is to begin by applying the first discount, calculating the amount to be removed from the original price. This is done by multiplying the original price by 
A simpler way to do this is to realize that the first price reduction makes the new price to be 
Example Question #1241 : Act Math
A 
As of right now, the man has 
Example Question #81 : Percentage
What is 
If necessary, round to the nearest percentage.
To calculate the percentage of a percent, convert both percentages to decimals and multiply:
Example Question #81 : Percentage
What percentage of 
To find what percentage 
Example Question #175 : Arithmetic
If Abraham’s collection in July is 40% of his collection at the end of December, how many stamps must have he obtained in December?
Abraham’s collection in July is 97 stamps. If that is 40% of his collection at the end of the year, his album must have 
Thus, he would have to get 
Example Question #1 : How To Find The Amount Of Sales Tax
Beth purchased $21.25 worth of groceries. The sales tax rate is 7.5%. What was her total bill?
$21.93
$23.41
$22.84
$22.11
$23.79
$22.84
The tax is calculated by 0.075 * 21.25 = 1.59375 or $1.59. So the total bill is the cost of items purchased plus tax, which is $21.25 + $1.59 = $22.84.
Example Question #1 : Sales Tax
The last week of August is tax-free week. If the standard tax rate is 8.25%, how much money would a shopper save buying a $50 dress and a $30 pair of shoes during tax free week?
$6.60
$8.00
$2.47
$4.13
$7.25
$6.60
Tax = Total Cost * 0.0825 = (50 + 30) * 0.0825 = (80) x 0.0825 = 6.6 = $6.60
Example Question #1 : How To Find The Amount Of Sales Tax
If a stick of deodorant costs $4.29 with a sales tax of 8.75%. What will the total cost of the item be?
(round to the nearest cent)
$4.67
$4.66
$6.47
$4.76
$4.37
$4.67
To solve for the tax charged multiply 0.0875 by the sales price of $4.29.
This is $0.375375. Add this to the original amount of $4.29.
The answer is 4.665375. Rounded to the nearest cent is $4.67
Example Question #1 : How To Find The Amount Of Sales Tax
On a grocery shopping trip you spent $15 on meat, $5 on cheese, and $25 on produce. If the total bill was $48.15, what is the rate of sales tax on the food?
0.7%
6.5%
7%
7.5%
0.75%
7%
Tax = Total Bill - Cost of Food = 48.15 – (15 + 5 + 25) = $3.15
Percentage of Tax = Tax / Cost of Food = 3.15/ (15 + 5 + 25) = 3.15 / 45 = 0.07 = 7%
Example Question #2 : Sales Tax
Regular sales tax is 
Total cost = $120 + $45 + $75 = $240
Cost of Sales Tax = 8.25% ($240) = 0.0825 ($240) = $19.80
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