further processing costs

a firm operates a process from which two joint products (X and Y) result in equal weights.Product X can be processed further to produce an enhanced product Z.The following information has been tabulated.
JOINT PRODUCT ENHANCEMENT TABLE
X Y
Sales value per batch 250000 500000
Joint costs apportioned 280000 280000
profit/loss (30000) 220000
further processing of X to produce Z
revised sales value per batch further processing costs
300000 55000
Which of the following is correct decision?
a)re-work joint cost apportionment and do not produce Z
b)re-work joint cost apportionment and produce Z
c)undertake further processing to produce Z
d)do not undertake further processing of X