Question 844148
{{{d=0.08aD}}} (Fried rule) or {{{d=D(a+1)/24}}} (cowling's rule).
{{{0.08aD=D(a+1)/24}}}
{{{0.08a=(a+1)/24}}}
{{{24*0.08a=a+1}}}
{{{1.92a=a+1}}}
{{{1.92a-a=1}}}
{{{0.92a=1}}}
{{{a=1/0.92}}}
{{{a=1.087}}}
If {{{a}}} is in years, {{{1.087years=1.087*12months=13 months}}} .