Final answer:
The population at the end of 4 hours is 103,680 yeast.
Step-by-step explanation:
To find the population at the end of 4 hours, we can use the formula for geometric progression:
P = P0 * (1 + r)^n
Where:
P is the final population
P0 is the initial population
r is the growth rate as a decimal
n is the number of time intervals
In this case, P0 = 50,000, r = 20% = 0.2, and n = 4.
Plugging these values into the formula:
P = 50,000 * (1 + 0.2)^4
Simplifying further:
P = 50,000 * 1.2^4
P = 50,000 * 2.0736
P = 103,680