ECONOMY Money market mutual fund assets decreased $2.24 billion to $382.70 billion for the week ended Wednesday, the Washington-based Investment Company Institute reported.

ACQUISITIONS Jordan & Shulte, a Miami-based law firm, acquired Washington-based Burchette & Associates, the eight-member firm founded by William H. Burchette, formerly a principal in Heron Burchette, which went out of business last February. Terms of the deal were not disclosed.

INTERNATIONAL Japan told Peruvian president-elect Alberto Fujimori that it would deliver $4.6 million in development aid after he takes office on July 28. Fujimori left Japan yesterday after a five-day visit that included a return to his ancestral home.

REGULATION Eli Jacobs, owner of the Baltimore Orioles, has been cleared by the Federal Trade Commission to purchase Restaurants Unlimited Inc., a Seattle-based restaurant group. Terms were not disclosed. Jurors in the racketeering and fraud trial of three Chicago Mercantile Exchange traders said they had a partial verdict, but the judge instructed them to continue deliberations and try to decide all 110 counts.

COMPANIES Southland announced the start of its revised exchange offers to restructure its debt and preferred stock, leading to the sale of 75 percent of the company to its Japanese partners. Sony is planning to increase purchases of European-made semiconductors in line with its target to boost the ratio of foreign-made chips in its products to 20 percent by July 1991, the company said. Toyota Motor Sales USA will take over the operations of Glen Burnie-based Mid-Atlantic Toyota on Oct. 1, the two companies announced. MAT distributed Toyotas in the District and in a five-state area, including Maryland and Virginia.

PEOPLE Melvyn Estrin, the Bethesda dealmaker who heads Centaur Partners Group, won a key victory when a Delaware court ruled that National Intergroup Inc. failed to get stockholder permission to tighten its anti-takeover rules. The decision would allow Centaur, which is seeking control of NII, to boost its stake in the firm to 19.9 percent from 16.5 percent.

Donald Trump owed New York City at least $13.6 million in real estate taxes, payable by midnight yesterday, a little more than a week after a bridge loan saved him from default on bonds and bank loans. A Trump Organization executive replied, ''No comment.''

CONTRACTS CBSI Federal, a Fairfax-based subsidiary of Cincinnati Bell Information Systems, received a $78 million, one-year contract with three one-year renewal options from the General Services Administration to provide computer support services to federal agencies.

ODD LOTS Ford and Chrysler favor boosting the 9-cents-per-gallon federal tax on gasoline by a nickel a year for three to five years, but General Motors opposes any increase in gasoline taxes.