Can we calculate BASIC with 57% and HRA with 26.6%

My company has hired a Labor person to prepare a salary breakup for our employees. He prepared Basic with 56% to 57.7% It is vary with each and every employees. and Also HRA with 26% to 27%
I am not able to figure this out that why he calculate with these odd percentages..
I had experience of preparing salary breakup with only 30% Basic and 40% HRA
Can anyone help me that the break up which i received from labor person is correct or not?
Please help!
Thank you!

HRA Component is subject to Provisions of Income Tax Act, in force.
Kritarth Consuling
5.3.19

calculate the HRA with basic, it will figure out 50% approx which is the cap limit of HRA