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Write a javascript program that prompts for the price and the tax rate for shopping in...

Write a javascript program that prompts for the price and the tax rate for shopping in a store. Calculate and display the tax amount and total price. For example, if the user enters 100 for the price and 7% as the tax rate, the program should displays $107.00 as the total price and $7.00 as the tax amount.

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Answer #1

Java script program to the given case. Copy the below code and paste it in any text editor and then save it as Cal.html format and then open that file in any browser(google chrome for instance) to run the program.

<html>

<body>

<script type="text/javascript">

//function to calculate and display values

function CalculateAndDisp()

{

//parseing the entered values and assinging them to respective variables

var price = parseFloat(document.getElementById("price").value)

var taxRate =parseFloat(document.getElementById("tax").value)

//checking whether the two numbers are valid or not

if(isNaN(price) || (isNaN(taxRate)))

{

//checking whether the 1st number is valid or not

if (isNaN(price))

{

alert("Please 1st a Number");

}else if(isNaN(taxRate)) //checking whether the 2nd number is valid or not

{

alert("Please 2nd Number");

}

}else //if both two numbers are valid then procede to calculate

{

//addition of price and taxRate

var totalPrice= price+taxRate;

//displaying the total price and tax rate

document.write("Total Price: $"+totalPrice);

//for new line

document.write("<br>");

document.write("Tax Amount: $"+taxRate);

}

}

</script>

<form >

Enter the price: <input type="number" id="price" name="number" /><br /><br />

Enter the tax rate: <input type="number" id="tax" name="number" /><br />

<input type="submit" value="Calculate" onclick="CalculateAndDisp();"/>

</form>

</body>

</html>

Output:

Input page:

Enter the price: 100 Enter the tax rate: 7 Calculate

Output page:

Total Price: $107 Tax Amount:$7

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