What is the average assets in billions of the company Bank of America, which has less than 49.01 billions in sales?
CREATE TABLE "2004_list" (
  "rank" real,
  "company" text,
  "headquarters" text,
  "industry" text,
  "sales_billion" real,
  "profits_billion" real,
  "assets_billion" real,
  "market_value_billion" real
);
SELECT AVG("assets_billion") FROM "2004_list" WHERE "company"='bank of america' AND "sales_billion"<49.01;