supply of imported coal with gcv 4600 gar for three years 2024-25,2025-26 2026-27 on as and when required basis , unit cif price , cost of coal per mt , insurance per mt not exceeding 0.05 usd /mt , ocean freight per mt , total cif value per mt , exchange rate as on 28-03-2022 , total cif value per mt in inr (a) (after conversion of the exchange rate) , basic custom duty (b)= 2.5% of (a)/ applicable duty , social welfare charges(c) = 10% of (b)/ applicable duty , igst (d)= 5% of (a+b+c)/ applicable duty , any other duties /taxes applicableexcluding green energy cess (e) , total duty(f)= (b+c+d+e) , total price( g) = total value in cif + total duty (a +f)