Sales of mutual funds have doubled in 1985.

Sales of stock, bond and income funds have hit $110.5 billion this year, more than double the record of $45.9 billion set in 1984, the Investment Company Institute reported. Total assets of all types of funds, including money-market funds, approached $495 billion, compared to $370 billion in 1984 and $95 billion in 1980, the institute said. The 1985 statistics are estimates for the full year, based on the first 11 months, it said.