Question 1148486
.
<pre>

1150 = 950 + 950*r*0.5


1150-950 = 950*r*0.5


200 = 950*r*0.5


r = {{{200/(950*0.5)}}} = 0.421 = 42.1%  annual percentage rate simple interest (aproximately).
</pre>

In my solution, 0.5 = 0.5 of an year = 6 months.