4 stroke engine understanding test.

During one 360 degree turn of the crankshaft of an 8 cylinder four stroke engine, how many cylinders fire on the compression stroke? :D

So if you got that answer, then how is it that engine RPM's are counted?
By 2 360 degree turns of the crank or one?
Isn't one 360 degree turn one RPM?

Keep in mind that in a four stroke engine the cylinder only fires every other time the piston comes to TDC which would take two 360 degree turns of the crank for each cylinder to fire on a compression stroke.

Good luck. :D