Discussion
Reducing empty weight by \( 8 \) per cent, with manufacturing cost proportional to weight to the power \( 0.8 \), reduces that cost by about
Answer: A
The factor is \( 0.92^{0.8} = 0.9354 \), a reduction of 6.5 per cent. The exponent below unity means cost grows a little more slowly than weight, but the leverage a designer has over cost through weight is still substantial.
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