Question

When their child was born, her parents invested $40,000 in a plan guaranteed to increase by 3% per year. The logarithmic function y=77.9 log x/40,000 can be used to determine the number of years, y, it takes for the investment to be worth x dollars.

After how many years will the investment be worth approximately 100% more than it was originally and how old will their child be when the investment is worth about $400,000?

Answer 1

A.) The investment is worth approximately 100% more after 23 years, and the investment is worth $400,000 when their child is about 78 years old
B.) The investment is worth approximately 100% more after 8 years, and the investment is worth $40,000 when their child is about 30 years old
C.) The investment is worth approximately 100% more after 30 years, and the investment is worth $400,000 when their child is aboit 50 years old

Answer 2

:(