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The logic is- 21 x 21 = 421 -21 = 420 25 x 25 = 625 – 25 = 600 17 x 17 = 289 – 17 = 272 15 x 15 = 225 – 15 = 210 Hence option 4 is true
The marked price of a cap is Rs. ‘x’. Rekha bought it at 20% discount and then sold it for Rs. ‘x’. Find the profit earned by her.