A colony of 6 million bacteria is growing in a culture medium. The population P after t hours is given by the formula (P = 6 × 10⁶ × 2.3ᵗ). Find the population after 4 hours.
a) (P = 69.42 × 10⁶)
b) (P = 65.88 × 10⁶)
c) (P = 62.34 × 10⁶)
d) (P = 58.80 × 10⁶)