$3.$ A corporation has a $$500,000$ beginning balance in Retained Earnings. Its net income for the year was $$200,000.$ Sales revenue amounted to $$1,000,000,$ and dividends declared and paid by year$-$end amounted to $$100,000.$ What was the ending balance in Retained Earnings?

a$.$ $$600,000$

b$.$ $$700,000$

c$.$ $$1,200,000$

d$.$ $$1,400,000$