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Logarithm - General Aptitude

Q1:

If log10 2 = 0.3010, the value of log10 80 is:

A 1.6020

B 1.9030

C 3.9030

D None of these

ANS:B - 1.9030

log10 80 = log10 (8 x 10)
  = log10 8 + log10 10
  = log10 (23 ) + 1
  = 3 log10 2 + 1
  = (3 x 0.3010) + 1
  = 1.9030.