Ahousehold uses at least 3000 minutes of long-distance telephone calls monthly and can choose to use the services of any of three companies: a, b and c. company a charges a fixed monthly fee of $10 and5 cents per minute for the first 1000 minutes and 4 cents per minute for alladditional minutes. company b’s monthly fee is $20 with a flat 4 cents perminute. company c’s monthly charge is $25 with 5 cents per minute for the first 1000 minutes and 3.5 cents per minute beyond that limit. which company should be selected to minimize the total monthly charge? formulate the problem and solve it in python using cvxpy.