Answer: B. $770,000
Step-by-step explanation:
The taxable income that they would report on the consolidate tax return would be $770,000 ($600,000 + $120,000 + $50,000)
The reason why we have added $50,000 is because the Ketchem sold $50,000 worth of supplies to Catcham and Catcham were able to pay that amount within 20 days. That is in the month of November.
Also, the consolidated report is to be made after December 27, therefore, we will include this transaction as it was before 27th December.