You can answer this question by writing the story as a math problem. The sentence tells us step by step what the math problem should be.
We start with $29.60 for parts + (and) 1 1/4 hours (or 1.25) x $56 + (and) $40.
So, 29.60 + 1.25 x 56 + 40= c
c = $139.60
