Financial General Bankshares Inc. earned $15.6 million ($2.25 a share) last year, a 17 percent gain over 1978's profits of $13.4 million ($1.93) the Washington bank holding company reported yesterday.

The bankers said higher interest rates and growth in all types of loans produced the record profits.

For the final quarter of the year, the Financial General banks reported net income of $4.1 million, (60 cents) up from $3.9 million (56 cents) in the same period a year ago.

At year end, Financial General showed assets of $2.29 billion, up 6.1 percent, deposits of $1.95 billion, up 5.9 percent, and loans of $1.27 billion, up 9.3 perent. The company owns 12 banks including Union First National of Washington, First American Bank of Maryland and First American Bank of Virginia.

MCD Holdings Inc., a real estate development firm active in the Washington-Baltimore area, reported profits of $765,587 (18 cents a share) compared with $489,611 (12 cents) in the previous fiscal years.

Wapora Inc., an environmental and energy consulting firm, reported increased revenues but decreased earnings for the first six months of fiscal 1980. Profits declined from $136,081 (23 cents a share) to $94,508 (16 cents). Wapora President J. L. Bregman blamed the decline on delays in receiving government contracts because of the government's altered fiscal year and on inflation.

Perpetual Assurance Services Inc., an insurance subsidiary of Perpetual Federal Savings and Loan Association, reported profits of $79,333 for the fiscal year ended Oct. 31, 1979. PAS President Willard Bernardin said the company has grown recently with the introduction of new insurance program.

Virginia Real Estate Investment Trust net income increased to $166,000 (16 cents) from $114,000 (9 cents) for the final quarter of 1979. Operating revenues were $524,000 (47 cents) compared with $471,000 (38 cents).

Virginia First Savings and Loan Assn. announced its earnings for the three months ended Dec. 31 increased to $391,000 from $345,000. Assets of the association reached $213 million at the end of the year.

New Virginia Bancorporation of Springfield reported earnings for 1979 increased 16 percent to just over $2 million from $1,732,000 the previous year. The bank's assets grew to $192 million at year end.