Alex grows an initial culture of 100 Rhizopus stolonifer fungi on a sample of bread. She wants to model the growth of the fungi according to the exponential equation A = Pe^(rt), where A is the final number of fungi, P is the initial number, r is the growth rate, and t is time elapsed in hours. If after 5 hours she measures the number of fungi to be 750, what is the value of r?
(A)0.403 (B)0.863 (C)2.015 (D)4.317
A