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2224.4 million dollars means 2224.4 times 1 million dollars 1 million dollars is $1,000,000 → 2224.4 million dollars = 2224.4 x $1,000,000 = $2,224,400,000 which is two thousand million, two hundred and twenty four million, four hundred thousand dollars, but as the USA uses the short scale (based on power of a thousand plus one) it can be read as: two billion, two hundred and twenty four million, four hundred thousand dollars
If a kilowatt-hour is 10 cents, then 3.9 billion kilowatt-hours (billion meaning 109) has a value of 0.390 million dollars, or 390 million dollars.
A billion is the same as a million times a thousand, or, a hundred times ten million.
500 million x 40 = 500,000,000 x 40 = 5,000,000,000 x 4 = 20,000,000,000 20,000,000,000 = twenty billion
Nine million times three billion is 27,000,000,000,000,000 (27 quadrillion).