Discount = 20% of ₹500 = ₹100. Selling price = ₹500 - ₹100 = ₹400.

Cost price per item = ₹15. Profit = 40% of ₹15 = ₹6. Selling price = ₹15 + ₹6 = ₹21 per item.

Each letter is coded by its position in the alphabet. F=6, A=1, T=20, H=8, E=5, R=19

After going North and South equally, he returns to original latitude. Only 6 km East displacement remains.

Apple, Orange, and Banana are fruits. Potato is a vegetable.

All others are perfect squares (11², 12², 13², 14², 15²). 250 is not a perfect square.

The word is reversed. PAINT reversed = TNIAP. SMART reversed = TRAMS

Each number is multiplied by 2. 15×2=30, 30×2=60, 60×2=120, 120×2=240, 240×2=480

Alternate letters in the alphabet. A(1), C(3), E(5), G(7), I(9), K(11)

(45/180) × 100 = 25%