Scientists began studying the elk population in Yellowstone Park in 1990 when there were 500 elk. They determined that t years after the study began the population size,N(t), was increasing at a rate proportional to 700 N(t). If the population was 600 in year 2000, estimate the size of the elk population in year 2010?

1. population size 570

2.population size 590

3.population size 650

4. population size 630

5. population size 610