Number of books sold by Viren in first 5 months = 3000 × 5 = 15000 Number of books sold by Viren in first 6 months = 3800 × 6 = 22800 Number of books sold by Viren in 6th month = 22800 - 15000 = 7800 Therefore, number of books sold by Viren in 7th month = 7800 × 0.70 = 5460
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The minimum value of 77 sin θ + 36cosθ is
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