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Mystery Box
Taxes, Tips, and Discounts
Percent Increase and Decrease
Percent Error
I = Prt
100
How do you convert a percent to a decimal?
Move the decimal two times to the left
100
Lunch costs $20. You tip 20%. How much is this in dollars?
$4.00
100
Find the percent increase from 200 to 300
50%
100
Estimate = 9 Actual = 10 Find the percent error.
10% error
100
Principle = $100 Interest rate = 3% Time = 2 years Find the interest owed.
$6.00
200
Convert 2.7 to a percent
270%
200
Find 5% sales tax on a $10 watch.
$0.50
200
Find the percent decrease from 40 to 10
75% decrease
200
Estimate = 4 Actual = 3 Find the percent error. (Round to nearest whole)
33%
200
Brian took out a loan for $400. If the interest rate is 2.5%, how much interest will he owe in 5 years?
$50.00
300
What percent of 60 is 30?
50%
300
Jacket used to cost $50. Now it is on sale for $35. What is the percent of discount?
30% off
300
You got a raise from $50,000 to $60,000 a year. Find the percent increase.
20% increase
300
Carlos thought lunch would cost $10 but it only cost $8! What is his percent error?
25% error
300
Angel put $350 into a savings account that earns 2% interest. How much interest will he earn in 6 months?
$3.50
400
Find 80% of 20
16
400
Find 8.5% tax on a $200 tv.
$17
400
What was the ORIGINAL price of a PlayStation4 if it went on sale for 40% off and is now $180?
$300
400
Adriana was actually supposed to measure 50ml of water but measured 45ml by mistake. What was her percent error?
10% error
400
I = $120 P = $600 r = ? t = 1 year Find the interest rate.
20%
500
14 is 10% of what number?
140
500
Find the total cost of $40 shoes with 9% tax.
$43.60
500
Mariachi is selling chocolate bars for $1 each. What was the markup percentage if they bought them for only $0.20 each?
400%
500
Sandra guessed 218 gumballs in the jar, but there were actually only 200. What was her percent error?
9% error
500
Chelsea deposited $800 into a savings account that earns 3.5% simple interest. How much will she earn after 18 months?
$42