need help on the first part

both products are $0.25 per pound. Formulate a linear programming model that can be used to determine the pounds of Brazilian Natural and Colombian Mild that will maximize the total contribution to profit. Let BR= pounds of Brazilian beans purchased to produce Regular BD= pounds of Brazilian beans purchased to produce DeCaf CR= pounds of Colombian beans purchased to produce Regular CD= pounds of Colombian beans purchased to produce DeCaf If required, round your answers to three decimal places. For subtractive or negative numbers use a minus sign even if there is a + sign before the blank. (Example: -300 ) The complete linear program is