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Given, cost of 50 kg rice = 2500

Now, we know the cost of 50 kg rice is 2500, so let’s try to find out how much each kg or 1 kg of rice would cost.

Therefore, cost of 1 kg rice =$\dfrac{{2500}}{{50}} = 50/ - $

Now that we know the rate of rice i.e. Rs. 50 per kg. , let us compute the cost of 20 kg of rice as per the question.

The cost of 20 kg of rice will be found by the product of weight (kg) and rate per kg.

So, cost of 20 kg of rice =$20 \times 50 = 1000/ - $

Such questions can also be asked the other way round, like how much rice in kg can be bought in Rs. 2000 when the 50 kg rice cost Rs. 2500.

Then the answer would be

Rice available for Rs. 2500 = 50

Rice available for Re 1 =$\dfrac{{50}}{{2500}}$

Then , rice available for Rs. 2000 =$\dfrac{{50}}{{2500}} \times 2000 = 40kg$