A publisher has orders for 500 copies of a certain textbook from San Francisco and 600 copies from Sacramento. The publisher has 700 copies in a warehouse in Novato and 400 copies in a warehouse in Lodi. It costs $5 to ship a textbook from Novato to San Francisco, but it costs $10 to ship it to Sacramento. It costs $15 to ship a textbook from Lodi to San Francisco, but it costs $4 to ship it from Lodi to Sacramento. The goal of the publisher is to minimize its total shipping cost. Formulate the problem with objective function and constraints Solve the problem by using Excel Solver to find out the optimal value of the objective function, and how many copies the publisher needs to ship from its two warehouses (Novato and Lodi) to San Francisco and Sacramento.