Definition of "on the money"

Did you have the wrong kind? I've never had the wrong kind. Ever. My worst one was right on the money.

1979, Woody Allen, Manhattan, spoken by Isaac Davis (Woody Allen)

Two of the A-4s landed on the money. The third was not so lucky.

1987 July, Maj. Michael B. Perini, “In Good Hands with Gold 11”, in Air Force Magazine‎, volume 70, number 7, retrieved 10 May 2014

For years, Gore had been dismissed, even ridiculed, for his traveling Power Point extravaganza warning about climate change. […] Today, few would disagree that Al was pretty much on the money.

2008 October 10, Richard Friebe, “How Nobel Winners Spend Their Prize Money: Al Gore”, in Time‎, archived from the original on 2014-03-06

I always felt that Bob Dylan was on the money when he sang: "When you got nothing, you got nothing to lose."

2011 August 19, The Secret Footballer, “For new boys there's nothing like the big time”, in The Guardian (UK)‎, retrieved retrieved 10 May 2014

Its mileage claims were right on the money: I averaged a little over 33 m.p.g. over a weekend of combined city-highway driving in the 2012 SL.

2013 February 1, Robert Peele, “The Mouse That Roars”, in New York Times‎, retrieved 10 May 2014