Casey, his spouse, and his mother jointly purchased an estate for $540,000. Their individual investments in the estate were in the ratio of 4:8:6, respectively. a. Calculate how much each person invested. Casey's Investment: Round to the nearest cent Spouse's Investment: Round to the nearest cent Mother's Investment: Round to the nearest cent b. Each of them decided to invest an additional $40,000 to develop the estate into a small family resort. Calculate their new investment ratio after the additional investment. Express the ratio in its lowest terms