1. What is the purpose of keyword final? Explain what happens when you use it and give an example.

2. Present Value (PV) is a formula used in finance that calculates the present day value of an amount received at a future date.

PV is calculated from the equation:

Where c is the cash flow, r is the rate of return and n is the number of periods. Write a program that reads the values of C,r,n and prints the Present Value. Here is a sample run. User input is in blue color.

Please enter C: 3000

Please enter r: 0.5

Please enter n: 2

3. Write short Java statements to complete each of the following tasks:

1. Test whether variable x is less than 5. If it is, print "x is less than 5"

2. Test if String x is equal to String y. if it is , print "Identical Strings"

3. Test whether variable x is even (An even number is an integer that is exactly divisible by 2) .if it is , increment x

4. Create an if statement that is unconditionally true