Insert commas suitable 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 twenty-one thousand ninety-two
(b) 7,452,483
Seven million four hundred fifty-two thousand two hundred eighty-three
(c) 99,985,102
Ninety-nine million nine hundred eighty-five thousand one hundred two
(d) 48,049,831
Forty-eight million forty-nine thousand eight hundred thirty-one

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