Given a polystyrene solid with 625,000 molecules having a degree of polymerization of 620, 930,000 molecules with a degree of polymerization of 810, and 780,000 molecules with a degree of polymerization of 9, what is the total number of molecules?
a) 2,335,000
b) 2,550,000
c) 2,755,000
d) 2,980,000