Mock test – biological assets

Hi, sir. Please help me to find answer. I looket at course notes but couldn find anything related

Scottson a farmer acquired 600 2 year old cows on 1 January 20X1 for $800 each. 100 calves were born in December 20X1. 150 animals were sold during the year for $840 each.

The fair value less costs to sell cows at 31 December 20X1 was:

Calves $200
2 year old calves $850
3 year old cows $900

How much should be recognized in the profit or loss in total in respect of the cows for the year ended 31 December 20X1?

A $111,000
B $26,000
C $91,000
D $75,000