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Explanation:

Cost/kg for week 1: 0.2 × 21 + 0.15 × 10 + 0.25 × 44 + 0.4 × 35
                             = 4.2 + 1.5 + 11 + 14 = 30.7

Cost/kg for week 4: 0.1 × 25 + 0.225 × 16 + 0.175 × 60 + 0.5 × 50
                             = 2.5 + 3.6 + 10.5 + 25 = 41.6

Increase in cost per kg = 41.6 – 30.7 = Rs. 10.9 = 1090 paise

Hence, 1090.

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