Answer:
39.88 years
Explanation:
Given that
Future value = $210,000
Present value = $30,000
Annual rate of interest = 5%
As we know that
Future value = Present value × (1 + interest rate)^number of years
$210,000 = $30,000 × (1 + 0.05)^number of years
7 = (1 + 0.05)^number of years
After solving this, the number of years is 39.88 years