Discussion
Replacing that AM transmitter with SSB carrying the same intelligence saves
Answer: A
SSB radiates only the one sideband:
\[ 600 - 100 = 500 \ \mathrm{W} \ \mathrm{saved} \]
a saving of 500 watts, or about 83 per cent, since the carrier and the redundant sideband are both discarded. 200 W would be the saving from suppressing one sideband alone. 100 W is the power actually transmitted. And the last option misses the point entirely: the message power is unchanged, which is exactly why everything else can be thrown away. Both economies are independent, which is why the three schemes form a ladder rather than a pair.
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