Calculate the correct answer. Shenzhen Limited is proud of their aggregate planning system. The Corporation produces bicycles for sale in various markets around the globe. Its inventory of bicycles at the end of the month of November 2017 was 200 bicycles. The demand during the month of November 2017 is forecast as 50 bicycles and the production during November 2017 was 100 bicycles. What was the inventory at the end of October 2017?