A recently introduced local anesthetic agent is claimed by the manufacturer to be several times as potent as procaine. The product is available in .05% buffered aqueous solution in 1.8mL cartridge. The max amt recommend over a 4hr period is 30mg. The amount is contained in about how many cartridges?
1) 1-9
2) 10-18
3) 19-27
4) 28-36
5) 36+
