Question 1075071
15,000 = 10,000(1+0.05)^t 
divide both sides by 10,000:
1.5 = 1.05^t
rewrite, 1.5 = 3/2
log(1.05)^t = log(3/2)
t*log(1.05) = log(3/2)
t = (log(3/2))/(log 1.05)
t = log_1.05(3/2) = ~8.3 years