dynamic analysis

1. What criterion determines whether it is appropriate to apply static or dynamic analysis?
2. Donna is trying to decide whether to pick the 60 tulips growing in her yard today or let them grow for another two years, in which case they will multiply and more will be available to pick. If Donna’s discount rate is 10 percent, at least how many tulips must be available in two years in order to justify her waiting until then to pick them?