Answer:
D. 18 years
Explanation:
Felicia has $175; doubling it will make it $350 ($175 x 2)
The interest per year is 4%
The applicable formula is A= P ( 1 + r)^n
where A = $350
P=$175
r=0.04
n= time ???
$350=$175 (1 +0.04)^n
350= 175(1.04)^n
350/175=1.04^n
2=1.04^n
log 2= (log 1.04)n
n= log2/ log1.04
n= 0.30102/0.017033
n= 17.70 year
n=18 years
