It is the first letter of each month of the Gregorian Calendar.
The answer is J as in July, as the ones ahead are January, February, March, April, May, June and then comes our answer.
$10.00 is the amount he will have to pay
25 Red Balls are there in the bag
The answer is 136 after multiplying by 4 for all the animals as well as 2 in case of humans