Answer:
Elston's retained earnings on December 31, 2017 are: 340,000
Step-by-step explanation:
We are asked for ending Retained Earnings that is Calculate as follows:

So our first step would be to know net income:

Revenue = 700,000 Expenses = 750,000
Net Loss = 50,000
Now, along with the other givens. We are able to calculate the Ending Retained Earnings
Dividends = 60,000
Beginning Retained Earnings = 450,000

The ending RE is 340,000