Rahimah's preferences over CDs (C) and sandwiches (S) are given by utility function of U(S,C)=SC + 10(S+C).
If the price of a CD is $9 and the price of a sandwich is $3 and Rahimah can spend a combined total of $30 each day on these goods find Rahimah' s optimal consumption bundle. Illustrate your answer on a graph.