4.1- Use proportional reasoning
&
4.2- The percent equation.
&
4.2- The percent equation.
What is the percent proportion?
part/whole = %/100
What does the "part" represent in the percent equation when we use it for percent change problems?
the amount of change
What does the "part" represent in the percent equation when we use it for markup/markdowns problems?
the markup or markdown amount
What is the formula for simple interest?
interest = interest rate x principal
What is the percent error formula?
amount of error/actual amount x 100
What is the percent equation?
part = percent x whole
What is the percent change from 50 to 70?
40% increase
Sean buys a shirt at a thrift store for $12.50. After cleaning it up, he resells it for $32.00. What is the percent markup?
156%
Simple interest refers to interest over what time period?
one year
A coach is expecting 32 players to try out for the basketball team. There are actually 40 players that try out. What is the percent error in the coach’s expectation?
20%
What is 30% of 50?
15
20% decrease
Originally, a bouquet of flowers was $35. However, when Cam when to the store and bought the flowers they were on sale for 70% off. How much did Cam buy the flowers for?
$10.50
Lilly opens a savings account with $800. She does not make any additional deposits or withdrawals. After one year, the amount in her savings account is $809.60. What is the annual interest rate of Lilly’s savings account?
1.2%
Sarah was measuring the length of a pencil and recorded it as 15 cm. However, the actual length of the pencil is 14.5 cm. What is the percent error in Sarah’s measurement? (round to the nearest hundredth)
3.45%
37/40 is what as a percentage?
92.5%
Tim bought 40 tickets at the carnival. After using some of the tickets to ride the bumper cars and play some games, he has 16 tickets left. What is the percent of decrease in the number of tickets that he has?
60% decrease
The wholesale cost of a dining room table at a furniture store is $1,780.60. The markup for the table is 40%. What is the selling price of the dining room table?
$2,492.84
Tanya’s savings account pays a simple annual interest rate of 3.45%. Suppose she deposits $6,000 in the account and makes no additional deposits or withdrawals. What will the total value of the account be after one year?
$6,207
A grocery store sells bags of potatoes labeled as 6-pound bags. Sally weighs one of the bags and finds the weight is 5.7 pounds. What is the percent error in the labeled weight?
5%
Mr. Smith earns a 8.5% commission on his total sales. Last month, he had sales of $67,230. He also earns a salary of $1,400 each month. How much did Mr. Smith earn last month in salary and commission?
$7,114.55
There were 100 students at a creative writing workshop last year. This year there are 140 students. What is the percent of increase in the number of students at the workshop?
40% increase
A camping store pays a wholesale price of $22.70 for a fishing rod and sells it for $31.78. What is the percent markup?
40%
Alex invests $500 in a savings account with a simple interest rate of 6% for 1 year. How much interest will Alex earn after 1 year?
$30
James was measuring the weight of a book and recorded it as 250 grams. The actual weight of the book is 240 grams. What is the percent error in James’s measurement? (round to the nearest hundredth)
4.17%