683.52=355(1+0.14)^N divide both sides by 355
683.52/355 = (1.14)^N take the log of both sides
log(683.52/355) = log (1.14)^N and by a log property, we have
log (683.52/355) = N(log(1.14) divide both sides by log(1.14)
log(683.52.355)/ log(1.14) = N = 5
