JAPAN DETAILS PLAN TO STAVE OFF TRADE PROBLEMS Japan's Liberal Democratic Party (LDP) has drawn up a detailed plan calling for large tax cuts and an increase in government purchases of foreign goods, the head of the committee working out the plan, Junichiro Koizumi, said. The plan will also urge the government to double 1985's official development assistance to 7.6 billion dlrs within five years instead of seven as the government had promised, senior LDP officials said at a press conference. LDP executive council chairman Shintaro Abe will explain the plan to U.S. Officials when he visits the U.S. On April 19. Abe's visit is to prepare for Prime Minister Yasuhiro Nakasone's talks with President Ronald Reagan later this month. Koizumi said the LDP plan will not specify the size of the tax cut or the amount of domestic demand to be stimulated. However, top LDP executives will work out figures so that Abe will be able to offer specifics to U.S. Officials. The proposed increase in procurement of foreign goods by the government will probably include the purchase of super computers, LDP officials said. According to the plan, Japan will also strive to solve specific trade problems with other nations and will encourage flows of funds to developing countries, the officials said. The LDP expects the measures to prop up the economy and lessen trade problems with the U.S., They added. The basic ideas of the LDP's plan were presented to and welcomed by monetary authorities of the major industrial nations in Washington last week, they said. The LDP plan will form the basis for the last of several packages to stimulate Japanese domestic demand and will be unveiled by the government in late May.