Please help/

Develop an age-structured population model for elk, where you divide the population to two cohorts: juvenile females and adult females. Juveniles do not reproduce; they reach reproductive maturity in 1 year. The probability of juveniles to reach adulthood is 50%. Adult females have on average 1 calf. a: Compute a long term proportion between (juveniles/adults) in this population. b: Will the population survive in the long term? c: How many calves would a female elk have to have every year for population to survive