He buy a bag of rice containing 70 kg for r 175 he sold it at rate of r 2.75/ kg then the profit is?

He paid 175/70 = 2.5 per kg so markup is 0.25/kg.

He paid 175 for 70 kg and sold for 2.75 x 70 = 192.5 so markup is 17.5 for 70 kg.

Profit involves more numbers, such as expenses and taxes, so can not be calculated from the given information.