Question 137751
{{{V(t)=V[0](0.85)^t}}}
where 
{{{V[0]=33500}}}
{{{15000=33500(0.85)^t}}}
{{{(0.85)^t=0.4478}}}
{{{t=log(0.85,0.4478)}}}
{{{t=log(10,0.4478)/log(10,0.85)}}}
{{{t=4.94}}}
The closest answer is J. 5 years.