Pricing routine

Hello gurus,

how to write pricing routine.Logic is as follows:

material m1-100;

service tax-10% of 100rs

edn cess tax-2% of service tax

total=110rs

work tax= it should be caluculated in the way

now 60% of 110 rs.=66

then 5% of 66=3rs

total net value=110(priceser taxedn tax) + 3(work tax) = 113 rs

what are the structures to be used and tables and what should be the logic to be written.

where to write this routine at

Options:

1.Alternate condition base value

2.Alternate caluculation type in tcode VOFM(where routines are writen)

Thanks in Advance