Insert commas suitably and write the names according to International System of Numeration :
(a) 78921092 (b) 7452283 (c) 99985102 (d) 48049831
(a) 78,921,092 = Seventy-eight million, nine hundred and twenty-one thousand, ninety-two.
(b) 7,452,283 = Seven million, four hundred and fifty-two thousand, two hundred eighty-three.
(c) 99,985,102 = Ninety-nine million, nine hundred and eighty-five thousand, one hundred two.
(d) 48,049,831 = forty-eight million, forty-nine thousand, eight hundred thirty-one.