A job requires three types of materials called A B and C The cost of A is 6 per unit the cost of B is 9 per unit and the cost of C is 3 per unit The labor required is 34 hours plus an additional hour for each unit of A that is needed and an additional 2 hours for each unit of B that is needed The labor cost is 24 per hour Write a mathematical expression for the cost of the job using the letters a b and c to reffer to the number of required units of A B and C respectively 34 a 26 X