The growth of bacteria makes it necessary to time-date some food products so that they will be sold and consumed before the bacteria count is too high. Suppose for a certain product the number of bacteria present is given by ƒ(t) = 500e^0.1t, where t is time in days and the value of ƒ(t) is in millions. Find the number of bacteria, in millions, present at each time.

(a) 2 days 

(b) 4 days 

(c) 1 week