inflation

Hi,
I’m having trouble understanding how to calculate the working capital /sales using inflation for NPV/APV..sometimes it is to multiply inflation rate to the power of the year and sometimes it is just to multiply inflation rate alone.

eg Dec 2018 Q3 working capital calculation – multiply inflation rate alone
but Jun 2014 Q2 sales and costs calculation – multiply inflation rate to the power of the year

When exactly do I multiply using the power of the year?

Many thanks!