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Let the cost price of articles ‘A’ and ‘B’ be Rs. 5y and Rs. y respectively Sum of cost price of articles ‘A’ and ‘B’ = 1200 × 2 = 2400 => 5y + y = 2400 => 6y = 2400 => y = 400 So, cost price of article ‘A’ = 5y = Rs. 2000 Cost price of article ‘B’ = y = Rs. 400 Selling price of article ‘A’ = 2000 × (127/100) = Rs. 2540 Selling price of article ‘B’ = 400 + 110= Rs. 510 So, average selling price of given two articles = (2540 + 510) ÷ 2 = Rs. 1525
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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