Forty million dollars.
It is four billion.
It is: 4% of 420,000 = 16,800 dollars
Six thousand four hundred and seventy-four billion.
If you consider 1 USD is equal to 47 Rps. Then 1 Billion USD is equal to 47,000000000 (In words Four thousand and seven hundred crores Indian rupees)
7 billion US dollars is worth about 4, 469,131,070 (four billion, four hundred and sixty nine million, one hundred and thirty one thousand, and seventy) GBP.
Expressed in words, 4.6 billion would be written "four billion, six hundred million".