Chris wrote:

So let's use a typical amp rated at 100 watts AM/CW/FM and 200 watts PEP on
SSB. Assuming that the transmitter is modulated at 100%, how many watts
should the carrier be?

Chris

Zero. As universally used, SSB means "single sideband suppressed
carrier". There is no transmitted carrier in this mode.

And, modulation percentage has no meaning when talking about SSB, since
it refers to the relationship between the modulation and the carrier.

Roy Lewallen, W7EL