Quantitative for business analysis (linear programming - simplex method etc)

Nurul Company sells three types of books: P, Q and R. Books P, Q and R are sold for RM7, RM5, and RM12 respectively. It takes a sales person 10 minutes to sell a book P, 15 minutes a book Q, and 12 minutes to sell a book R. The delivery cost for book P is RM1 each, for book Q is RM0.50 each, and book R is RM0.80 each. During a week, a sales person is only allowed delivery expenses of not more than RM75. The selling time is restricted to only 1,800 minutes. The unit cost of book P, Q, and R are RM3, RM2, and RM4 respectively. Determine the highest profit for selling these books.

Note: You might have to prepare a report for proposing an optimal solution by using quantitative analysis techniques.