Inventory cost & profit share of interest free bank

Inventory cost.
One of my client has received interest free bank loan for the purpose of merchandise business.
The bank has charged the client br 4.2m i.e about 28% of 15m as a profit share and the total loan i.e 19.2 will be settled within 3 years on equal installment basis @17% amortisation.
My question here, can we treat the total br 4.2m (bank profit share)as part of inventory cost or periodic expenses ? why?

Kind regards,
Alemayehu G.