Solving Proportions
What is 81% of 540?
437.4
Write the formula for the percent equation.
part = % x Whole
A sleeping bag that cost $85 is marked up 22%. What is the new price?
$103.70
The formula for percent change is what?
l new - old l = (p/100%) x Old
A loan of $6400 at 12.5% simple interest is to be repaid in 4.5 years. What is the total amount to be repaid?
$10,000
64 is what percent of 80?
80%
What percent of 48 is 16.5?
34.375%
A toy that had sold for $16.50 was on sale for $11.55. What was the percent of discount?
30% discount
What is the formula for percent error?
l estimated - actual l = (p/100%) x Actual
Your granny took out a $6, 500 automobile loan with a rate of 7%. After 3.5 years, how much interest will she have to pay?
$1, 592.5
Of the traffic violations cited by Officer Huang, 64% were for speeding. If Officer Huang cited 48 motorists for speeding, how many violations were there altogether?
75 violations
At 15 miles per hour, your dad is driving 30% of the speed limit. What is the speed limit?
50 miles per hour
A bicycle the usually sells for $120 is on sale for $96. What is the percent of discount?
20%
Gramps guesses that 240 fish live in his pond, but he finds that 235 do. What is Gramps' percent error?
l est. - actual l = (p/100%) x Actual
2.12%
Jill has $525 in a savings account that pays 4% simple interest. How much interest will she make in her account after 3 years?
$63.00
Last Friday, 720 people at Data Tech drove cars to work. Of these, 585 bought gas on the way home. What percent of the drivers bought gas on the way home?
81.25%
32% of your aunt's cats prefer napping alone. If this percent represents 8 cats, how many cats in all does your aunt have?
25
A wheelbarrow sells for $36. Next month the price will be marked up 6%. How much will the wheelbarrow cost next month?
$38.16
The 7th graders won 12 dodgeball games against the 8th graders last month. This month, they have won 14. What is the percent change for their dodgeball wins?
l new - old l = (p/100) x Old
16.67% increase
Phil invested $1,300 for one year at a rate of 6.5%. How much interest did he gain?
$84.50
This year 18.75% more students have joined the Long Hill High School Drama Club. The records show that 6 new students have joined. How many total students were members last year?
32 students
760 geese have been given GPS tracker bracelets for research. Of these, 65% traveled to Canada. How many geese traveled to Canada?
494
If there is a sales tax of 5%, how much will it cost to buy a $57 handbag?
$59.85
The weatherman stated last week that there would be 5.5 inches of snow on Friday, but it snowed 3.5 inches. What was his percent error?
l estim. - actual l = (p/100%) x Actual
57.14%
Victor had a two-year loan with a simple interest rate of 13% annually. At the end of the two years he had paid $1454.44 in interest. What was the original amount of Victor's loan?
Interest = p x r x t
1454.44 = p x (13/100%) x 2
p = $5,594