There would be 10% loss if rice is sold at Rs. 5.40 per

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There would be 10% loss if rice is sold at Rs. 5.40 per kg. At what price per kg should it be sold to earn a profit of 20% ?

Let C.P. per kg be Rs. x then,
x - 10% of x = 5.40
⇒ x = 6
∴ Required S.P. = Rs. [6 + 20% of 6] = Rs. 7.20