# Aptitude - Logarithm - Discussion

### Discussion :: Logarithm - General Questions (Q.No.8)

8.

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

 [A]. 1.6020 [B]. 1.9030 [C]. 3.9030 [D]. None of these

Answer: Option B

Explanation:

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

 Mahesh said: (Feb 8, 2012) Why take (8*10) in step 1st?

 Gayathri said: (Nov 3, 2013) log10 80 = log10 (8*10) Because in question they are give log10 2 value for that we split this 80 and we can able to write 8 in terms of power 2 that's why it is split.

 Mehdi said: (Sep 13, 2015) Why we take (8*10) in first step describe me in detail?

 Dheeraj said: (Jul 22, 2017) Log10^80=80log10. Now log10^2=2log10=0.3010. Log10=0.1505. Put the value, 80*0.1505=12.040.

 Jasmitha said: (Sep 4, 2017) @Mahesh. Just because 10*8=80 so we are splitting.

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