Debbie takes out a loan of $800 to buy a new laptop. The loan has a simple interest rate of 4% annually.
How much interest will she pay in 3 years?

No links please!

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup