Formulate a LP model for the following situation.

Maytag, a manufacturer of gas dryers, produces two models, a standard (STD) model and a deluxe (DEL) model. Production consists of two major phases. In the first phase, stamping and painting (S & P), sheet metal is formed (stamped) into the appropriate components and painted. In the second phase, assembly and testing (A & T), the sheet metal components along with the motor and controls are assembled and tested. (Ignore any scheduling problems that might arise from the sequential nature of the operations.) Information concerning the resource requirements and availability is shown in the following table:

Each dryer (STD or DEL) requires one motor and a respective control unit. Define X1 and X2 to be the number of STD and DEL dryers manufactured per period, respectively. The objective is to determine the number of STD and DEL dryers to produce so as to maximize the total contribution.