A college student runs a side business detailing cars. in the first year, the business made $12,000. the function c(t) = 12,000 · (1.10)t models the total yearly earnings, c(t), in dollars, for a given number of years, t. what is the percent rate of change, and how is it interpreted in the context of the problem?
a. the percent rate of change is 10%, which means the total yearly earnings decrease by 10% each year.
b. the percent rate of change is 10%, which means the total yearly earnings increase by 10% each year.
c. the percent rate of change is 90%, which means the total yearly earnings decrease by 90% each year.
d. the percent rate of change is 90%, which means the total yearly earnings increase by 90% each year.