50+50( 1+x)+50( 1+x)? = 182
50+50+50x+50+ 100x+50x? = 182
50x? + 150x=32
25x? +75x- 16=0
(5x- 1)(5x+ 16)=0
The solution is X 1=0.2 or X2=-3.2 (omitted).
So X=0.2=20%