Please explain how option 3 is correct choice?

Note that they gave the starting population to be 10,000 with equal number of males and females.

Question 3: PENGUINS

Jean assumes the colony will continue to grow in the following manner:
  • At the beginning of each year, the colony consists of equal numbers of male and female penguins who form couples.
  • Each penguin couple raises one chick in the spring of each year.
  • By the end of each year 20% of all the penguins (adults and chicks) will die.
  • One year old penguins will also raise chicks.
Based on the above assumptions, which of the following formulae describes the total number of penguins, P, after 7 years?
A. P= 10 000 x (1.5 x 0.2)7
B. P= 10 000 x (1.5 x 0.8)7
C. P= 10 000 x (1.2 x 0.2)7
D. P= 10 000 x (1.2 x 0.8)7

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