i = 11%/2 =5.5%
period = 6 months
Time to double = 72/i = 72/5.5 = 13.09 periods (6 months)
Time = 13.09 /2 =6.55 years
0.11 / 2 = 0.055 semi-annual rate
time in 6 month periods to double: ln(2) / ln(1.055)
t = 0.69315 / 0.05354
t = 12.94616 six month periods
12.94616 / 2 six month periods per year = 6.47308 years
Approximately 6-7 years! It'l double itself
