Like other children, Mr. Santos’ daughters also love ice cream. Mr. Santos bought half gallon of ice cream for them every pay day (15th and 30th of the month). Last month, Mr. Santos got promoted in his job. With this, an additional salary of ₱5,000.00 was added to his ₱20,000 basic salary. Now, he can buy 2 half gallons of differently flavored ice cream every pay day.​