KARACHI - Dollar in open market recorded substantial gain on the central bank ruling curbing imports of dollar from the exchange companies. Dollar in the open market hit 113 rupees on back of the last week ruling whereby exchange companies could only import around 35 percent against the surrender of small foreign currencies while 65 percent to be managed by the banks. A senior exchange dealer said that if the central bank revert the decision and allows exchange companies to import dollars against the small currencies, dollar will dip against the domestic currency.