Propose the Linear programming model for the following exercise

Hello, I will need that you propose a lineal programming model for the following exercise: A mattress factory has forecasts of the demand for its products for about 4 months. The capacity of production with the normal shifts is of 1400 monthly mattresses, if it schedules extra hours it can produce 200 additional units, this generates an additional cost of $ 12,000 / unit and if it is not sold in the month it is manufactured there is a storage cost of $ 7,000 / unit. The company manages an initial inventory in zeros and tries at the end of the month not to leave units for the next period. The company seeks to reduce storage and production costs through optimal production scheduling. Month Demand Nov 1500 Dec 1000 Jan 1900 Feb 1300 REQUIEREMENT: Propose the lineal programming model. BUDGET: 10USD DUE TO : NEXT 2H OR LESS