Rakesh on selling a lamp for Rs. 450 bears a loss of 20%. To earn a profit of 20%, he should sell the lamp for 

Let the C.P be x

⇒ x – (20% x) = 450

⇒ (80/100)x = 450

⇒ x = 562.5

∴ Required selling price = 562.5 + (20% of 562.5) = 675