Question

Suppose an investment of $5,000 doubles every 12 years. How much is the investment worth after 36 years? After 48 years?

Answer 1

This can be done without exponential equations.

It doubles every 12 years so it has doubled in price
5,000 * 2 = 10,000

After 36 years the value has increased 8 times
5,000 * 8 = 40,000

After 48 years the value has increased 16 times
5,000 * 16 = 80,000