Assignment

3-3:

Develop the Income Tax Calculator

In this a

ssignment

, youll use nested if statements and arithmetic expressions to

calculate the federal income tax that is owed for a taxable income amount.

This is the 2017 table for the federal income tax on individuals that you should use

for calculating the tax:

Taxable income

Income tax

Over...

But not over...

Of excess over...

$0

$9,275

$0 plus 10%

$0

$9,275

$37,650

$927.50 plus 15%

$9,275

$37,650

$91,150

$5,183.75 plus 25%

$37,650

$91,150

$190,150

$18,558.75 plus 28%

$91,150

$190,150

$413,350

$46,278.75 plus 33%

$190,150

$413,350

$415,050

$119,934.75 plus 35%

$413,350

$415,050

$120,529.75 plus 39.6%

$415,050

1.

Open the HTML and JavaScript files in this

folder:

JavaScriptProgramming-Assignment

3\income_tax\

Note that the JavaScript file has some starting JavaScript code for this

application, including the $ function and an onload event handler that attaches a

function named pr

ocessEntry() to the click event of the Calculate button and

moves the focus to the first text box.

2.

Code the processEntry() function. It should get the users entry and make sure its a

valid number greater than zero. If it isnt, it should display an error message. If it is

valid, it should pass the value to a function named calculateTax(), which should

return the tax amount. That amount should then be displayed in the second text box.

The focus should be moved to the first text box whether or not the entry is

valid.

3.

Code the calculateTax() function, but to start, just write the code for calculating the

tax for any amount within the first two brackets in the table above. The users entry

should be converted to an integer, and the tax should be rounded to two decimal

places. To test this, use income values of 9275 and 37650, which should display

taxable am

ounts of 927 and

5183.50.

4.

Add the JavaScript code for the next tax bracket. Then, if you have the time,

add the

JavaScript code for the remaining tax

brackets