Answer:
(Fatwa: 99/846=/1429)
In the abovementioned case, the supplier is like agent and an agent can take the charges of his work, but this charge should be fixed, whether by e.g. 100 and 50 or in form of percentage. You are allowed to take help from them; also it is right to work without their help.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
