A: cost= 3*55+.35m
B: cost=3*50+.40m
set the costs equal, and solve for m.
For

to be continuous at

, we need to have

Note that

means that

, but that

is *approaching* 5. We're told that for

, we have

We can write

and the limit would be

and so

is discontinuous.
None of them are the definite answer but D is the closest one. The other ones are completely wrong with or without the actual question. Brainliest pls