Answer:
I think it is C but it could also be A,like I know it's either because of the lines but I just don't know where the shading should be.What I'm sure of is that B and D are definitely wrong.
Step-by-step explanation:
Sorry i dont know
1+3+6=10
40=10 units
diidde by 10
4=1unit
4 times 1=4
4 times 3=12
4 times 6=24
they paid $4, $12 and $2
