To find a percentage of a whole, multiply the percent (written as a decimal)
by the whole. Remember, to convert a percent to a decimal, divide by 100.
percent (as decimal) × whole = part (of whole)
First, find the amount of sales tax.
7.5% written as a decimal is 0.075.
0.075 × $55.60 = $4.17
Then, add the sales tax to the cost of the clothes.
$55.60 + $4.17 = $59.77
So, Summer spent $59.77 with tax included.
To find percent increase or decrease, divide the change in
amount by the original amount, and convert to a percent.
percent (as decimal) = change in amount ÷ original amount
First, find the decrease in the number of employees.
125 − 105 = 20
Then, find the percent decrease by dividing the decrease by the original number of employees.
20 ÷ 125 = 0.16
0.16 written as a percent is 16%.
So, the number of employees at the company decreased by 16%.
7th Grade Math - Problem Solving with Ratios & Percents Lesson