If income of Vandana is 25% more than that of Aarti, then

If income of Vandana is 25% more than that of Aarti, then income of Aarti is how much per cent less than of Vandana ?

Let Aarti's income be ₹ 100
∴ Vandana's income = ₹ 125
∴ Aarti's income is ₹ 25 less than 125.
∴ Required percentage = (25/125) x 100% = 20%