- 7 (Click the icon to view the information.) During April (a month during peak season). Curt Carriage Company had 13,000 passengers. Eighty percent of passengers were adults ( $21 fare) while 20% were children ( $13 fare). Read the requirements. Curt Carriage Company Data table If passenger volume increases by 12% in May, we would expec 12%. This is because costs change in direct proportion to changes in volume. As a result, the Which figures would remain the same as in April? Assuming that a 12% increase in volume is still in the same relevant range, we would expect costs to remain at their present level