Heritage Watercraft makes reproductions of classic wooden boats. The bottleneck in the production process is fitting wooden planks to build up the curved sections of the hull. This process requires the attention of the shop's most experienced craftsman. A total of 2,100 hours is available per year in this bottleneck operation. Data concerning the company's four products appear below:

Just need the example figure out the problem

What is the optimal production plan for the year?