117.23-(56.09-2.77)=117.23-56.09+2.77=117.23+2.77-56.09=120-56.09=63.91
117.23-(56.09-2.77)=117.23+2.77-56.09=120-56.09=63.91
117.23-(56.09-2.77)=117.23+2.77-56.09=120-50-6-0.09=63.91