Help with 172#2 Interest Rate

Help with Pg 172 #2 interest (using a main routine and one method for calculating interest on a given balance with a given interest rate)

Step #1:

Create a new class called InterestTable
Create a new method called calcInterestAmt

Use these comments:
// When Investment amount is 3000 and rate is .065 answer should be 195
// When Investment amount is 5 and rate is .065 answer should be .325
// When Investment amount is 3000.99 and rate is ..1 answer should be 300.099

The input parameters:

Double Investment Amount (ex: 3000)

Double Interest Rate (ex: .065)

The output parameter is:

Double Interest Amount

Process

return the investment amount * the interest rate

Compile and verify that this works with all the test cases in the comments.
To verify, right click on the calcInterestAmt method

Step #2:

Add a new method in InterestTable called test to do the following:

Calculate the interest on 3000 at 6.5% interest by calling calcInterestAmt and passing it 3000 and .065.

Print that result.

Calculate the interest on 5 at 6.5% interest by calling calcInterstAmt

Print that result.

Calculate the interest on 3000.99 at 1% interest by calling calcInterstAmt

Print that result.

Step 3:

Add a new method in InterestTable called printOneYearInterest.

Use these comments:

// When you receive in 1990, 2900.99, 100, .065 it should return 3195.099 and print :
//   1990 2900.99 100 195.099 3195.099
// When you receive in 2000, 5, 0, .065 it should return 5.325 and print:
//    2000 5      0     .325 5.325

The input parameters:

Int Year

Double lastAmount

Double newInvestmentAmount

The output parameter:

Double endOfYearAmount

Process

   Calculate the interest on lastAmount + newInvestmentAmount at 6.5% by calling calcInterestAmt

   Print the following:

    The year (from the input parameter) and a tab (\t)

    The lastAmount and a tab

    The newInvestmentAmount and a tab

    The interest you calculated above and a tab

    The total amount (which is the lastAmount + newInvestmentAmount + interest you calculated)

   Return the total amount

Run the test cases by right clicking on the printOneYearInterest method

Step 4:

Change the main method to print a table:

Add a print line to print the headings :

year tab (\t) Original Amt \t New Investment \t Interest \t End of Year Total

Call the method printOneYearInterest giving it : 2007 as the year, 1000 as the last amount, 0 as the new investment, and capture the end of year amount returned in a variable called endAmt.
Loop 24 times always calling printOneYearInterest, giving it:

one more than 2007 each time as the year

the last end of year amount (starting with endAmt from before the loop started, and then always using the one from the last loop)

100 as the new investment

Test this by running the main routine. You should see a table with 25 lines.