FinCorp Inc. has been using the services of San Bernadino Brokerage Company (SBBC) for the past six months. SBBC has informed FinCorp Inc. that the geometric mean monthly return was 7 percent and that over the past six months FinCorp Inc. earned 16 percent, 19 percent, −23 percent, 14 percent, −8 percent, and an unknown amount in the last month. Determine the missing return.