Percents
Financial Math
Exponential and linear functions
Half-life and doubling-time
Fun Questions! Think Trivia not math.
100

What is 29% of 51



14.79

100

Isabel makes a one-time deposit of $3,000 in an account that earns an APR of 2.25%compounded continuously.

Determine the annual percentage yield (APY). 

2.276%

100

A magical fish gives you 32 pennies on October 3rd and says she will double them every day. So on October 4th, you have 64 pennies, and by October 5th, you get 128 pennies.

How many pennies will you have on day 9?

2^13 pennies

100

A certain medication breaks down at a rate of 5.25% per hour. Find the approximate half-life.



13.33 hours



100

What is the color of a Giraffe's tongue? 

Black or Purple

200

A pair of pants is 13% off and is now priced at $75. What is the original price of the pants? Round to nearest two decimal places.



$86.21

200

35 years from now, Sarah would like to have $500,000 in her retirement account. She can obtain an APR of 4.5% compounded monthly. Assuming that no additional deposits are to be made to the account, how much will Sarah need to deposit now in order to reach her goal?

103,809.12

200

Find the equation of the line that passes through (5,7) and (10,20).



y=13/5x-6



200

Suppose that the population of a town is increasing by 1.9% per year.

 if the population was 900,000 in 2000, what should we expect the population to be in 2025?

1,440,778 people


200

What country has a unicorn as their national animal?

Scotland

300

In 2021 the price of your favorite drink increased by 10%. The next year, the price of your favorite drink increased again, this time by 17%. By how much (in % terms) has the price of your favorite drink changed overall?



28.7%

300

Alli and Sam would like to save $8,300 for a honeymoon and they can afford to deposit $170 monthly into an account earning an interest of 2.15% compounded monthly. If they deposits $170 monthly (combined, they are not each putting that amount in) for the next 4 years, will they reach their goal and how much short/over will they be?

Yes they will reach the goal, they will have saved 8,513.20 and be $213.20 over the goal.

300

An Ostrich was 13 inches long when he was born and on his 20th birthday, he was 71 inches tall.

a) create a linear model to represent this situation

b) according to the linear model, how tall will the Ostrich be on his 25th birthday?

a) y=2.9x+13

b) 85.5in or 7ft 1in. 

300

The half-life of Ibuprofen is 6 hours in the bloodstream. At 10:00 a.m. you have a headache and you take a 25 mg dose of Ibuprofen (imagine this dose is for a small child if you will).

a) how much Ibuprofen would be left in your bloodstream at 6 p.m.?

b) how long will it take to reach 5 mg of Ibuprofen in your bloodstream? 

a) 9.92 mg

b) 13.93 hours 


300

What is the only land mammal that cannot jump?

Elephant 

400

Sam needs a mortgage loan of $350,000. He can get a 30 year fixed-rate at an APR of 4.75% compounded monthly, with a closing cost of $800 and 2 points. Determine Sam's total closing cost, monthly payment, and the amount of interest paid over the loan term (in $ and % terms).



Total Closing Cost: $7,800

PMT: $1825.77

Interest ($): $307,277.20

Interest (%): 46.75%

400

How many hearts does an Octopus have?

500

What year was the first Coachella? 

1999

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