about government contract bill

Venkatesh K N (student) (178 Points)

15 August 2018  
Work done certificate amounting ₹200000 (excluding IT, LR, LC, CBF)

My question

on which amount I have to calculate on GST(12%)
***Taxable amount I want

1) 200,000
OR
2) 178,571 (200,00*100/112)