Answer:
n = 12.63 year
Explanation:
Present Value = $300,000
Future Value = $1,000,000
Annual Interest Rate = 10%
Period = n years
Present Value * (1 + Interest Rate)^Period = Future Value
$300,000 * (1 + 0.10)^n = $1,000,000
1.10^n = 3.333
taking log on both side
n * ln(1.10) = ln(3.333)
n = 12.63 year