2025 GESS PRELIMS P1 Q15

Some bacteria were introduced into a culture. The number, \(N\), of bacteria \(t\) hours after being introduced is given by \(N=500\times4^t\).

1. How many bacteria were introduced into the culture?[1]
2. Find the percentage increase in the number of bacteria at the end of the second hour.[2]
3. Find the time taken for the number of bacteria to reach 64 000.[1]