A man working 48 hours per week earns ₹ 2,400. If he works for 36 hours per week, he will earn:

1. ₹ 3,200

2. ₹ 900

3. ₹ 1,800

4. ₹ 1,080

Let the man earn ₹ x.

Since it is a case of direct variation.

$\therefore \dfrac{48}{2400} = \dfrac{36}{x}\\[1em] \Rightarrow x = \dfrac{36 \times 2400}{48}\\[1em] \Rightarrow x = \dfrac{86,400}{48}\\[1em] \Rightarrow x = 1,800$

Hence, option 3 is the correct option.