That “Cha-ching!” you may have heard last night was the sound of someone winning $50,000 in Saturday’s Powerball drawing. The Tennessee Lottery announced a ticket sold in Knoxville matched four of the five white numbers drawn and the red Powerball number. Until the prize is claimed, lottery officials cannot provide further information. The winning numbers drawn were 16, 29, 43, 45 and 56; the Powerball number was 25. Nobody matched all six numbers, so Wednesday’s estimated jackpot is up to $50 million.