Thread: Need Help applying discount

hey community, I'm working on the final component of my assignment and cant figure out how to do a calculation in regards to applying discounts. For my assignment I need to apply a 10% discount on each unit brought in groups of 5. So for example If a purchase was made for 17 DVD-RW+ drives which have a unit price of $30.00 each, then the multi buy discount would apply to the first 15 items (3 groups of 5) and the discount calculation would be: so 10% of $30.00 is $3 X $15 which is a $45.00 discount, but I cant figure out how to program it, i need the discount value to be displayed on the screen, my code so far is

if (menuChoice == 'C' || menuChoice == 'c') {
 
                // Product and price information entry
                System.out.println("Welcome to Tabular sales summary");
                System.out.println();
 
                System.out.print( " Please enter product code : ");
                productCode = scanner.nextLine();
                System.out.println();
 
                System.out.print("Enter product description : ");
                productDescription = scanner.nextLine();
                System.out.println();
 
                System.out.print("Please enter unit price : ");
                unitPrice = scanner.nextDouble();
                System.out.println();
 
                System.out.print("Please enter ammount of units purchased : ");
                quantityPurchased = scanner.nextInt();
                System.out.println();
 
                System.out.print("Salesperson : ");
                salesPerson = charInput.readLine();
                System.out.println();
 
                //Layout of recept
                System.out.print( "Prod. code    ");
                System.out.print("Product Description                ");
                System.out.print("Unit Price         ");
                System.out.print("Qty      ");
                System.out.println("Total");
 
                System.out.print("-----------  ");
                System.out.print("-------------------------          ");
                System.out.print("-------------      ");
                System.out.print("------    ");
                System.out.println("------");
 
                //Calculations for display
                subTotal = unitPrice * quantityPurchased;
 
 
 
             }

If anyone could help me I would be very thankful

could i perhaqps do it with if statements for instance

if (quantityPurchased >= 5 && quantityPurchased <=9)
 
additionalDiscount = (unitPrice * 5) / 100 * 10;   
 System.out.println(addiltionalDiscount);

and if so then its going to take alot of if statements. I know the formula for working out percentages i just cant figure out how to write the algorithm code as i am new to java and cant find the information in our text book nor in the lecture notes