Backus Tractor Sales the Accountant Prepared the Following List of Account Balances from Account

Backus Tractor Sales
The accountant prepared the following list of account balances from the company's records for the year ended December 31,2013.
Determine the following amounts for Backus Tractor Sales:
A) The balance of Retained Earnings at the end of 2013 .
B) The total stockholders equity at the end of 2013.
C) Name the two events that might cause stockholders equity to increase.