'Sefu The' has been appointed as the manager of a tourist site. He classifies maintenance costs as a mixed cost as it increases with increase in number of tourists and even at days when the site is closed, he still needs to bear some maintenance costs. Taking data of the last 7 months he got the following scatter graph: Site Maintenance Costs C . 0 No. of tourists + If a = 33200 ; b = 55800; C = 90100; d = 12700 TAKE AT LEAST TWO DECIMAL PLACES WHEREVER APPLICABLE [1 mark] (a) the fixed maintenance cost per month is $ [1 mark] (b) the variable maintenance cost per tourist is $ [1 mark] (c) if 15800 tourists visit the site next month, the total maintenance cost is expected to be $