How to calculate value of log e 1.25

Question

In book , it is calculated by log e^10 1.25 ×2.3 = 0.2287

But I didn't understand why 2.3 is multiplied with 1.25 and how it is calculated?

Answer 1

logb(x) = logc(x) * logb(c)

Log e(1.25) = log 10(1.25) * log e(10)

 

the 2.3 is approximately log e(10)