I believe since you are looking for the angle of M<ABC, you just add both 120 and 25 together, since they practically share a point.
So 120 + 25 = 145
So I guess 145 would be your answer.
I remembered this type of problem from Geometry.
Answer:
c=b-x/d hope it helps..............
105% =$34.02
100% (cost without sales tax) = 34.02/1.05 =$32.40
The lowest terms for 19/31 would be 1