Following information are given for three mines of a company receiving explosives from three suppliers.

Explosive suppliers	Mine-1	Mine-2	Mine-3	Supply capacity (tonne)
Supplier - S	10	15	50	2500
Supplier - O	5	2	100	2500
Supplier - I	30	40	20	3000
Explosive demand (tonne)	1000	2000	5000

Considering the initial basic feasible solution of this transportation problem, using North-West corner method, the transportation cost of explosives supplied to the company, in Rs., is