Final answer:
The function

is an exponential growth function with a growth rate of 5% per period.
Step-by-step explanation:
The function

represents an exponential growth because the base of the exponent, 1.05, is greater than 1. This results in the quantity increasing over time. In this function, the growth rate r can be determined from the base of the exponent. As the base is 1.05, it indicates that the quantity is growing at 5% per period (since 1.05 is equal to 1 + 0.05, with 0.05 representing the 5% growth). Therefore, the growth rate for this function is 5%.