Answer
11.7%
Work Step by Step
rate of growth wanted
1987 had 27 birds
2010 had 347 birds
$y=27*(1+x)^0$
$27=27*1$
$2010-1987=23$
$347=27*(1+x)^{23}$
$347/27=27*(1+x)^{23}/27$
$347/27=(1+x)^{23}$
$12.85185=(1+x)^{23}$
$12.85185^{1/23}=((1+x)^{23})^{1/23}$
$12.85185^{1/23}=(1+x)$
$1.1174186=1+x$
$1.1174186-1=1+x-1$
$.1174186=x$