Look at "C'
If we multiply 25 * 1 hour + 40 we get 1 * 25 + 40 = 25 + 40 = 65
If we multiply 2 * 2 hours + 40 we get 2 *25 + 40 = 50 + 40 = 90
This seems to be the rule....check it yourself for 3 hours, 4 hours and 5 hours to see that this rule is correct....!!!
help asap
