Discussion
An exchange rate is quoted as \( 1 \) drag count being worth \( 40 \) kg. A fairing saving \( 3 \) counts but weighing \( 100 \) kg is
Answer: D
Correct answer: Worthwhile; 3 counts are worth 120 kg
At 40 kg per count, the three counts saved are worth \( 3 \times 40 = 120 \) kg, against a fairing that weighs 100 kg. The change therefore shows a net benefit of 20 kg on the common measure and is worth making. The whole purpose of the exchange rate is to turn a comparison of unlike quantities into this one subtraction.
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