Salman buys 1 kg iron for ₹ 12 and sells it for ₹ 14. How much does he earn when he sells 32 kg of iron? [ 3 Marks ]

Money earned by Salman by selling 1 kg of iron = ₹ 14 – ₹12 = ₹2
Hence, money earned by him selling 32 kg of iron = ₹2 × 33 [ 1 Mark ]

This can be calculated as follows:

$$\begin{array}{ccc}\times & 30& 2\\ 2& 30\times 2=60& 2\times 2=4\end{array}$$
[ 1 Mark ]
By adding the numbers in last row,
32 x 2 = 60 + 4 = 64 [ 1 Mark ]
Therefore, by selling 32 kg of iron, Salman earns ₹64.