Consumer Price Index(CPI) and Inflation Percentage Relation

Can anyone explain me the relation between AICPI and Inflation percentage.
Or in other way,calculate inflation percentage based on CPI numbers given below

Consumer Price Index Numbers for Industrial Workers on Base 2001=100

CPI(IW) Base 2001=100 Monthly Index Letter - July 2017

JANUARY 2016

269

FEBRUARY 2016
267

MARCH 2016
268

APRIL 2016
271

MAY 2016
275

JUNE 2016
277

JULY 2016
280

AUGUST 2016
278

SEPTEMBER 2016
277

OCTOBER 2016
278

NOVEMBER 2016
277

DECEMBER 2016
275

JANUARY 2017
274

FEBRUARY 2017
274

MARCH 2017
275

APRIL 2017
277

MAY 2017
278

JUNE 2017
280

JULY 2017
285

This is not a straightforward calculation. Please do check this - http://pib.nic.in/newsite/PrintRelease.aspx?relid=86838