Arlington-based American Management Systems Inc. said its profit rose 80.8 percent in 1990, compared with the previous year.

The strength of sales increases to a wide variety of customers pushed American Management Systems's profit to $10.5 million ($1.04 per share) from $5.8 million (56 cents) in 1989.

Profit in the fourth quarter rose 19.1 percent over the same period in 1989, to $4.7 million (47 cents) from $4.0 million (39 cents).

American Management Systems develops generic software packages and tailors them to clients' needs.

Frank Nicolai, chief financial officer, said the rise was partly because the company has a diverse list of customers to buy its products.

"We have a portfolio of businesses in different marketplaces," Nicolai said. "It gives us a little more balance."

Revenue in the fourth quarter rose to $72.9 million from $61.2 million.

The company said that in the fourth quarter, revenue from telecommunications clients was up 87 percent, compared with the same period in 1989.

Revenue from financial institutions was up 20 percent in the quarter, revenue from federal agencies was up 7 percent and revenue from universities was up 6 percent, the company said.

The company's association with International Business Machines Corp. -- IBM owns 10 percent of AMS's stock -- helped to increase revenue from other corporate clients by 32 percent, the company said.

American Management Systems reported that total revenue for 1990 was $261.9 million, up 16.2 percent from 1989's $225.3 million.

Bowl America Inc., the Alexandria-based chain of bowling centers, reported slightly lower earnings for the second quarter on mostly flat revenue.

The company, which has more than two dozen bowling centers in the Washington area and in Florida, had profit of $1.27 million (44 cents a share) for the three months ended Dec. 30, down 2 percent from $1.29 million (45 cents) the year before.

Revenue rose to $7.33 million in the second quarter from $7.30 million in 1989.

For the six months ended Dec. 30, earnings were also down a bit to $1.56 million (54 cents) from $1.6 million in the same period a year earlier.

Revenue was up slightly to $12.8 million for the six months from $12.5 million the year before.