Help me understand Salary Structure

CTC - 5 LPA (fixed) was written in JD Basic pay - 20k/month

Flexible pay* - 18k/month 10% of Flexible pay is HRA

PF - 2.5k/month

I am not able to understand my take home or in-hand salary. Will i get 38k or 20k? would be great if you can give more info