operation-wise yield

Dear PP Gurus,

Clients requirement is that they want yield range at every operation.

eg: to make a tablet following 5 stages :

1) Granulation

2) Lubricated granules

3) Compression( core tablet)

4) Coating (coated tablet)

5) Sorting.

now the question is in granulation while doing the confirmation they can put yield as +5% and -5%.

so they have bsize 100 kg output is 95 to 105

now when they do second confirmation they want limit of +2% to -2% of previous confirmation.

same way it continues, different % range is maintained for different operation.

how to do this. please guide

thanks

kailash thakkar