A manufacturing company started production in the year 2015. At that year it produced 72000 units. Its goal was to increase the production each year by 10% of the production of the preceding year.

a) Determine the production of the year 2023.

b) What is the total production until the end of the year 2022?

c) Determine the year in which the annual production will reach about 144000 units per year?