Question
A person bought an article and sold it at a loss of 20%.
If he had bought it at 10% loss and sold it for 74 more, he would have gained 30%. Find the profit percent if he had sold it at Rs 220.Solution
Let the C.P be Rs S.P = x*80/100=Rs 80/100x Then, New C.P = x*90/100=Rs 90/100x New S.P =90x/100*130/100=117/100x According to question 80/100x+74=117/100x 37/100x=74 x=74*100/37=200 C.P of an article = Rs 200 S.P of an article = Rs 220 Profit % =220-200/200*100= 10%

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Simplify:
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If p = 36 - q - r and pq + r(q + p) = 310, then find the value of (p² + q² + r²).