Explanation:

- The grocer claims to sell sugar at Rs 48/kg.

- He actually gives only 900 g for every 1000 g.

- We need to find the effective cost per kg.

- Cost price of 1000 g (1 kg) is Rs 50.

- Selling price for 900 g is Rs 48.

- If 900 g costs Rs 48, then 1000 g costs $\frac{48}{900}\times 1000=53.33$ approximately.

- Percentage profit = $\frac{SellingPrice-CostPrice}{CostPrice}\times 100$.

- The effective selling price per kg (Rs 53.33) gives us profit.

$\mathbf{\text{Correct Answer: 4, 6.7\%}}$

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