2-LINGO Code (20 pts). Write down a LINGO code incorporating LINGO problem. Demand for a product for the following quarters is 500, 700, 600, 300 units, respectively. The price per units starts at $30 in the first quarter and increases by $5 each quarter thereafter. The supplier can provide no more than 500 units in any one quarter. Although we can take advantage of lower prices in early quarters, a storage cost per units starts at $3 in the first quarter and increase by $1 each quarter thereafter. In addition, the number of units that can be h form one quarter to the next must be 50 or less sets to solve the following eld over