A town doubles its size every 42 years. If the population is currently 29,580, what will the population be in 84 years?
In 42 years, the population will be 29,580*2= 59,160
In the following 42 years, adding up to 84 years, we'll have:
59,160*2 = 118,320 people.
Answer: 118,320 people