For JAVA please!

Do not use for statements, arrays, or anything more complex than if statements, switch statements, and math computations for the following problem. Thank you in advance!

A company charges by weight for delivery of packages. The first pound to deliver costs 3 dollars, and 50 cents are added to the price for each extra four ounces. (One pound equals 16 ounces.) e.g A box that weighs more than 16 but no more than 20 ounces will cost 3.50 dollars to deliver, and a box that weighs more than 20 ounces, but no more than 24 will cost 4 dollars. and so on. Write a method that will compute the cost of the delivery using a double-valued method.