Solve for b) please. Thank You.

4. Postal Bill Calculator: Assume that you are working as the cashier in the poslaj office in Kedah. There are 3 types of charges summing up to be the total payment of customer goods' postal fee. Administration fee for each postal is RM2. Another charge will be distance charge which stands for RM0.02/KM. Third charge is customer postal weight's charge which consists of the following: Weight