Check the picture below.
Make sure your calculator is in Degree mode.
The net force will be 3 N to the right.
12N - 8N = 4N - 7N= -3N. 3N is the net force to the right.
started with 225 added 75
225 +75 = 300 then added 200
300 +200 = 500, took 50 out
500-50 = 450 then added 125
450 +125 = 575
895-575 = 320
Answer is B $320
Let

. Then

, and so as

, you have

. The limit is then equivalent to