Real Life Percents
Simple Interest
Mark ups/Mark downs
% Increase/Decrease
100

What number is 28% of 75?

What is 21?

  • Formula: Part = Percent × Whole
  • Solution:
    • Part = 0.28 * 75
    • Part = 21
100

Identify all the parts of the formula I = Prt

I = Simple Interest P = Principal r = Annual Rate t = Time (years)

  • I: Simple Interest
  • P: Principal (the initial amount of money invested or borrowed)
  • r: Annual Interest Rate (expressed as a decimal)
  • t: Time (in years)
100

A $20 shirt is marked down 15%. What is the new price of the shirt?

What is $17?

  • Discount Amount: 0.15 * $20 = $3
  • New Price: $20 - $3 = $17
100

Determine the percent increase or decrease: 12 inches to 36 inches

What is 200% increase?

  • Change: 36 inches - 12 inches = 24 inches
  • Percent Change: (24 inches / 12 inches) * 100% = 200%
  • Type of Change: Increase
200

If you have 282 text messages in your inbox, and your phone says its 94% full, how many messages can the inbox hold?

What is 300?

200
Derek deposits $400 into the bank. His interest rate is 6% and he plans on leaving it in the bank for 3 years. How much will he collect after the time elapses?
What is $72?
200
You complete an order online for $62.00, shipping and handling on your order is 12% of your total. What is the new total for your order?
What is $69.44?
200
Why can we have more than 100% increase, but not decrease?
Because 100% decrease would give you 0, anything more would not exist.
300
If an average basketball player makes 77% of their free-throws, how many should they make out of 465? Round to the nearest whole number.
What is 358?
300
A student takes a loan out to pay for school. He takes out $5000 with a 4.5% interest rate. How much interest will he have to pay after 30 months?
What is $562.50?
300
A store buys a pair of jeans for $65. To make a profit, they re-sell the jeans for $95. What is the percent mark up on the jeans? Round to the nearest tenth.
What is 46.2%?
300
Determine the percent increase or decrease 54 atoms to 21 atoms
What is a decrease of 61.1%?
400
A real-estate agent makes a 2.5% commission on houses that they sell. How much money do they make on a $865,000 house?
What is $21,625?
400
How long would it take for a principal payment of $200 to double with a 9% interest rate? Round to the nearest tenth.
What is 22.2 years?
400
A furniture store is having an "everything must go sale: 70% off!" If the original price of a couch was $899, what is the new price of the couch?
What is $269.70?
400

FREE POINTS!

Way to go, Ruby!

500
Your bill at a restaurant is $34.55. You know that tax is 6% and you want to tip 20% on the amount before tax is applied. What is the new total of your bill?
What is $43.53?
500
If you deposit 650 dollars, and after 3 1/2 years you have $725 dollars, what is your annual interest rate? Round to the nearest whole percent.
What is 32%?
500
If a video game is $65, and the store is running a "Buy 2 get one free" special, what percent is the cost from the promotion compared to if you bought all three full price?
What is 66.7%?
500
Determine the percent increase or decrease 54.5 cm to 63.8 cm
What is 17% increase?
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