At Townsend High School there are four class years 9th grade, 10th grade grade, and 12th grade There are 300 students in the 9th grade year and as the class year increases each subsequent grade year has approximately 20% more students in its class than does the previous year (For example the 10th grade class year has 20% more students in it than the grade class year) About how many students attend Townsend High School in total