Answer:
Ordinary loss of $18,000
Step-by-step explanation:
As for the provided information the loss is shared equally be each partner.
therefore, if total loss of partnership firm = $42,000
Loss on account of each partner = $42,000/2 = $21,000
Therefore, loss as share of Mark = $21,000
But as provided the basis of Mark = $18,000
Therefore, accordingly the loss up to the amount of basis shall be sett off in the current year itself, and then thereafter the remaining loss of $21,000 - $18,000 = $3,000 shall be carried forward.