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Mass of empty box = m_empty=2.75 kg
Five (5) laptops are packed, each laptop has a mass=m_laptop=1.65 kg
Total mass of 5 laptops = m_5laptop=(5 x 1.65)kg=8.25kg
Total mass including that of box and laptops=m_total,
It cost $40 for the first 5kg and $ 3.15 for each kg above
Total cost = $40+$3.15(11-5)=$40+$3.15 x 6=$40+18.9=$ 58.9
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