The JJJ Construction Co. needs to rest some special trucks which will haul 20 standard loads of dirt per day, or it can rent a medium duty model truck which will have 15 standard loads per day. The heavy duty model cost P1800 a day to rent while the medium duty model costs P1600 a day. In order to operate the heavy duty model, however, it is necessary to hold a proficiency skill level, and JJJ Construction has only 4 truck drivers who have necessary skill level. If JJJ Co. needs sufficient capacity to have a total of 155 standard loads of dirt per day, determine the number of each truck drive that should rent to minimize its costs. Thank you