Problem:
Retained Earnings at the beginning and ending of the accounting period was $550 and $1,200, respectively.
Required:
Question: If revenues were $2,100 and dividends paid to stockholders were $450, expenses for the period must have been
A.	$1,650.
B.	$1,000.
C.	$650.
D.	$1,450.
Note: Explain all calculation and formulas.