1.) A working student earns Php 25.50 an hour. How much does he earn in 4 hours? 2.) Mrs. De Guzman's class rode 3.8 miles to the observatory. The next closest observatory is 13 times as far. How many miles is second observatory? 3.)At Php 42.55 a liter, what is the cost of 7.5 liters of gasoline? 4.)Mother went to the supermarket. She bought 1.8 kg of chicken at Php 120.50 a kilo. Find the cost of the chicken.​