11,900=1200(1+0.0625)^t
(1.0625)^t=11,900/1200=9.91666666666666...
take log10 av both sides...t*log10(1.0625)=log10(9.91666666)=0.9963657153446193
t=0.9963657153/log10(1.0625)
log10(1.0625)=0.026328938722349284
0.9963657153446193/0.026328938722349284=37.84298812237561 yeers
0.29881223756*365=307.69 daes