Numbers - General Aptitude

Q1:

72519 x 9999 = ?

A 725117481

B 674217481

C 685126481

D 696217481

E None of these

ANS:A - 725117481

72519 x 9999 = 72519 x (10000 - 1)
  = 72519 x 10000 - 72519 x 1
  = 725190000 - 72519
  = 725117481.