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Different cash and credit price

Q: Is installment business halaal or haraam in Islam. Explaination: Company XYZ purchasing Product from Market in 1000 Rs. and Sell it on 2000 RS (double Rate) in 20 installments (100 Rs per day). One recory man is reserved for it for Recover Payment from Buyer Shops. (Recory man Salary is about 15000/month) But ON Cash Payment, Company Sale Same Product in (1500 RS). Is this type of business is halal or Haram in Islam.