The answer is $213 because you subtract the price sold by the price he bought them for and then you add them together (see work)
109.93 lbs
since the quantities vary directly, then
w(moon) = kw(earth ) ← ( k is the constant of variation )
to find k use the given condition
k = w( moon ) / w( earth ) = 
given w(earth) = 218.24
w(moon) =
= 109.93
Answer:
the answer is C. No, it fails the vertical line test.