Discussion
Replacing 200 individual analogue wires each weighing 15 grams per metre with one twisted pair of 60 grams per metre saves, over 30 metres,
Answer: A
The wires weigh \( 200 \times 15 \times 30 = 90 \) kilograms against \( 60 \times 30 = 1.8 \), a saving of 88.2. Repeated across an airframe this is the weight argument that carried the digital bus. Repeated across a fleet it is decisive.
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