What is the tonnage of a Goodman air conditioner model number cpk-j30-1a?

Tonnage is 2 1/2 tons. The 30 indicates the amount of BTUs in hundreds(30hundreds or 3000). 12000 BTUs=1ton, 2400=2tons ,1/2 ton=600 BTUs, thus 12000+12000+6000=30000 or 30hundreds BTUs=2 1/2 tons.