How to Calculate Adjusted and Unadjusted 52 Week High and Low Price on a Bonus Issue

Hi,
This is regarding BIOCON LTD. scrip that went for a Bonus Issue recently.
Biocon announced for a Bonus Issue of 2:1 with 15/06/2017 as Ex-Date.
Attached a screenshot from BSE India that shows the 52 Week Unadjusted and Adjusted High Low for the Biocon Scrip.
Could someone provide the formula for arriving at the Adjusted price 52 week high and low from the Unadjusted Price 52 week high and low as shown in the screenshot?

Thanks in advance!