The wholesale price index of sugar in 2008 compared to 2004 is 140. If the cost of sugar was ₹15 per kg in 2004, then the cost of sugar in 2008 is:

₹21 per kg

The correct answer is Option (3) → ₹21 per kg

$\text{Price index} = \frac{\text{Current price}}{\text{Base price}} \times 100$

$140 = \frac{\text{Price in 2008}}{15} \times 100$

$\frac{\text{Price in 2008}}{15} = 1.4$

$\text{Price in 2008} = 15 \times 1.4 = 21$

The cost of sugar in 2008 is ₹21 per kg.