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 twenty-one thousand ninety-two) (b) 7,452,283 (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)