Struggling to understand how I get this answer

[PizzaWizza]

Struggling to understand how this answer works.
This is just a worked example from a university paper.

W = 220∫ V^-1 dV...between the limits of 0.1 & 0.2...(Answer is 152.49 Rad)

I understand that the basic rule for a negative power would give us ln x, but from here I would say that the answer would be the difference of ln 0.2 and ln 0.1?
I need to get ln(2) for the answer to be correct, just not sure how?

 

[Merlin3189]

Surely ln(0.2) - ln(0.1) = ln(0.2/0.1) = ln(2)

 

[PizzaWizza]

Surely ln(0.2) - ln(0.1) = ln(0.2/0.1) = ln(2)

I was deducting ln 0.1 from ln 0.2, thanks

 

[SteamKing]

I was deducting ln 0.1 from ln 0.2, thanks

Same difference:

ln (0.2) = -1.6094
ln (0.1) = -2.3026

ln (0.2) - ln (0.1) = -1.6094 - (-2.3026) = 0.6931 = ln (2)

 

[PizzaWizza]

Same difference:

ln (0.2) = -1.6094
ln (0.1) = -2.3026

ln (0.2) - ln (0.1) = -1.6094 - (-2.3026) = 0.6931 = ln (2)

Ah. I see. That makes it clearer. Thanks