Answer:
a. 17.19
Explanation:
We use the formula: A=P(1+r/100)^n
A= P ( 1+ 2/100) ^ n
Let P = $ 3.5
Hence, A= $ 3*3.50
= $ 10.50
Hence, 10.50 = 3.50*(1+6.6/100) ^n
or 3 = (1.066) ^ n
Taking log on both sides we get, log 3 = n log (1.066)
Hence, n = Log 3/ log (1.066)
n = 17.18909595 Years