# Calculate the total returns from the total return index [closed]

I have the Total Return Index(RI) for several companies.

I know that I can calculate the log retunrs with $ln(RI_t/RI_{t-1})$. Therefore my first guess would be to calculate the total returns like that:

$RI_t/RI_{t-1}$

Is this true?

No, it would be $$(RI_{t}-RI_{t-1})/RI_{t-1}$$