IF this is a math question, the other answers covered it.
IF this were a macroeconomics question, there's something called the "money multiplier." For Keynesians this is the aggregate effect of an increase in spending, which is some multiple of that spending. This is the basis for economic policies calling for "spending our way out of the recession."
For monetarists, there is a money multiplier in the financial sector due to fractional reserve banking. Obama early in his presidency defending policies helping banks by saying each dollar injected into the banking system would have a multiplier effect on the economy. He may have used 10 times as the multiplier.
Or there's the accounting identity MV=PQ where M is the money supply V is the velocity of money, P is the price level and Q is the quantity of products. Increase M and its effect is multiplied by V on its effect in the real sector. Initially it may directly affect Q, but eventually it causes the price level to rise, with less real effect on output
All these multipliers tend to result from fiat money, a money that is not convertible into gold or any real product. Fiat money is money because the government makes it legal tender. Otherwise it would have no value.