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ATQ, Let the cost price of articles 'G' and 'H' be Rs. '9x' and Rs. '11x', respectively. Selling price of article 'G' = 9x × 1.5 = Rs. '13.5x' Selling price of article 'H' = 11x × 1.3 = Rs. '14.3x' According to the question, 14.3x - 13.5x = 110 0.8x = 110 x = 110 ÷ 0.8 x = 137.5 So, average of cost price of articles 'G' and 'H' = (9x + 11x) ÷ 2 = 10x = 10 × 137.5 = Rs.1375
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(I) Quadratic trend
(II) Linear trend
