In order that a $10000 investment grow to $20000 in seven years, what must be the annual rate of interest? Seven years could be called the doubling time for this investment. Notice that it is being assumed that the interest is compounded.

Ahealth-food producer has 250 samples of a new snack to distribute in the mall. the producer has to keep at least 50 samples for display in the health food for the product launch. how long will the samples last if consumers are taking the samples at a rate of 25 every hour