PNP transistor equations
NPN and PNP transistors work essentially the exact same way. PNP's just reverse the voltage and current flow. So for an NPN, to bias it on you have the base at 0.7V ABOVE the emitter, for a PNP you would have the base 0.7V BELOW the emitter. For an NPN, current flows INTO the base. For PNP, current flows OUT of the base.

Current flow is also reversed. In an NPN collector current flows into the collector and out the emitter. In a PNP it goes in the emitter and out the collector. But other than that the basic equations apply equally to both.

One other thing, in general PNP's are slower and have lower gain than NPN's but this is becoming less true as fabrication processes improve