The bat population in a certain Midwestern county was 340,000 in 2021, and the observed doubling time for the population is 28 years.a). Find a function n(1) = n?2 ?/a that models the population t years after 2021.b). Find a function (1)=ne?? that models the population t years after 2021. You may round r to 4 decimal places.c). What is the relative growth rate of the population per year, to the nearest tenth of a percent?d). To the nearest tenth of a year, how long does it take the population to reach 2 million?