1 credit = 750 gp
255 credits worth in room #1.

room #1 worth = 191,250 gp

467 credits worth in room #2

room #2 worth = 350,250 gp

*special offers*
all of room #1 = 180,000 gp (save 11,250 gp)
all of room #2 = 330,000 gp (save 20,250 gp)
all of room #1 and room #2 = 450,000 gp (save 91,500 gp)