Question 859278
Best understanding is that you are asking for this:
{{{225((1+0.05)^x/0.05)=300000}}}


Starting from {{{1.05^x=200/3}}}
{{{log(10,1.05^x)=log(10,200)-log(10,3)}}}
{{{x*log(10,1.05)=log(10,200)-log(10,3)}}}
Either log table or electronic calculator,
{{{x*0.021189=2.30103-.47712}}}
{{{highlight(x=86.08)}}}