General Percents
Percent of Change
Simple Interest
Compound Interest
Sales
100
A pitcher throws 75 pitches. Of these, 72% were strikes. How many strikes did the pitcher throw?
54 strikes
100
Identify the percent of change: 72 paper clips to 63 paper clips
12.5% decrease
100
Find the new balance of the account after it earns simple interest: $925 at 2% for 2.4 years
balance: $969.40
100
What does compound interest MEAN?
Interest is calculated more than once during the period of a loan. Instead of the principal, you use the balance each time you calculate interest.
100
In Hawaii, the sales tax on a $240 surfboard is $12. What is the percent of sales tax in this state?
5%
200
A water tank has a capacity of 550 gallons and is 66% full. How many MORE gallons of water can you put in the tank before it overflows?
187 gallons
200
Find the new amount: 68 students increased by 125%
153 students
200
Find the interest rate: I=$24, P=$400, t=2 years
3%
200
What will my balance be at the end of 2 years if I deposit $100 in an account which earns 5% interest compounded annually (once a year)?
$110.25
200
A store pays $70 to make a product and decides to mark it up by 10%. What is the selling price?
$77
300
0.5% of what number is 12?
2400
300
Identify the percent of change: 16 centimeters to 44.2 centimeters
176.25% increase
300
Find the amount of time: I=$30, P=$500, r=3%
2 years
300
A bank compounds the loans it gives monthly. How much total interest will be charged on a $400 loan at 8% after a quarter of a year (3 months)?
$103.88 in interest
300
What does a 60% off sale MEAN?
It means you find 60% of the original price and subtract it off. Or it means you're only paying 40% of the original price.
400
How many points out of 300 do you need to earn on a test to get a score of 90%?
270 points
400
Find the percent markdown (round to the nearest hundredth of a percent): A game on sale from $42.00 to $16.00
61.90% markdown
400
If you put $3,000 in a CD (certificate of deposit) account at 5.6% simple interest, how long will it take to earn $336 in interest?
2 years
400
A $129.50 stereo is discounted 40%. The next month, that sale price is discounted 60%. What is the final sale price?
$31.08 (cheap!)
500
Derek was expecting 20 guests at his party. Because he was going to have a giant ice cream cake, 30% more people said that they'd come than he expected. Sadly, it stormed that day, so 50% of the total party guests left to care for their pets. How many party guests were left at the party? Was the final total more or less than he originally expected?
13 guests were left; this was less than he expected
500
A car loses 15% of its value each year. After one year, the car has a value of $13,600. What is the original value of the car?
$16,000
500
How many years will it take for $2,000 to double at a simple interest rate of 8%?
12.5 years
500
How much total interest will I earn after a year has passed if I deposit $200 which earns 3% interest compounded biannually (twice a year)?
$12.18 in interest
500
At a restaurant, your bill is $28. You need to pay 6% tax. On the total, you will leave a 20% tip. How much is the tip (round to the nearest penny)?
$5.94 for a tip...though I would just round that to $6. :)
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