I cant figure out the right numbers

The number of student registrations and the related costs over the last nine months Studihart University are given below: Month Students Registered Costs January 900 $88,000 February 850 $85,000 March 1,900 $188,000 April 2,000 $187,000 May 650 $66,000 June 300 $34,000 July 100 $16,000 August 1200 $120,000 September 150 $15,000Using the high-low method, what amount would Studihart University record for fixed cost per month