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@ (b) (d) Explain FOUR (4) types of values that can be stored and manipulated by Java. Classes are used to group a few related, named, data values associated with an entity. It is typically a noun referring to a problem. Explain why do programmers want to make various classes as opposed to putting everything into different methods in the one class that contains the main method? If a warehouse received 350 orders in July and 400 in August, what was the percentage of increase in orders from July to August? Develop a Java program to calculate and display the percentage of increase in orders. 1 2 689 GAWN H Modify the following code segment using if-else statements. Assume that grade has been declared as a type char. 3 4 switch (grade) { case 'A': 10 ) System.out.println("Bravo!"); System.out.println("Great!"); System.out.println("So-so"); System.out.println("Let's talk"); [4 marks] case 'B': case 'C': [2 marks] default: [7 marks] [5 marks] I