Marcus' Reading Challenge

Marcus is planning a reading challenge for the month of March. He wants to read a total of 1,200 pages. If he reads X pages in the first 10 days, he plans to read twice as many pages in the next 10 days. For the remaining 11 days of March, he will read 5 times the number of pages he read in the first 10 days.

If Marcus reads 100 pages in the first 10 days, how many pages does he read in total by the end of the month?