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  1. If log102 =0.3010 and log107 = 0.8451, then the value of log10 2.8 is ?
    1. 0.4471
    2. 1.4471
    3. 2.4471
    4. 14.471
Correct Option: A

log102.8 = log10(28/10)
= log 28 - log 10
= log (7 x 4 ) - log 10
= log 7 + 2 log 2 - log 10
= 0.8451 + 2 x 0.3010 - 1
= 0.8451 + 0.6020 - 1
= 0.4471


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