4. A beach resort charges an entrance fee of Pnp 10.00 to children ages 3-10 years old and Php15.00 to children from 11-17 years old. If a person is 18 years old and above, they must pay an entrance fee of Php20.00, however adults aged 65 and above is given a discount of 20%. Write the piecewise function that describes what the beach resort charges. ​