jQuery Math Decimal Points

I have a jQuery function that adds up a total.  The issue is, if the number  has 2 decimal points and the last number is 0, it does not show the Zero.  For eample if the number is 9.30  it only shows 9.3.  How do I force it to show the Zero?

Here is part of my function, I hope it helps.

// START TAXES
 		if( state_a == 'WA') {
 			tax = .0011;
 		} else if ( state_a == 'NJ' ) {
 			tax = .009;
 		} else if ( state_a == 'WV' ) {
 			tax = .0055;
 		} else {
 			tax = 0;
 		}
 		
 		var sub_p_t = parseFloat(final_premium_total) * parseFloat(tax);
 		
 		var round_sub_p_t = Math.ceil(sub_p_t * 100) / 100;
 		
 		var pre_tot = parseFloat(final_premium_total) + parseFloat(sub_p_t);
 		
 		if( state_a == 'WA') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );
 			$(".tax-display").html('(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');
 		} else if( state_a == 'WV') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );
 			$(".tax-display").html( '(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');
 		} else if( state_a == 'NJ') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );	
 			$(".tax-display").html( '(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');		
 		} else {
 			premium_total = final_premium_total;
 		}
 	//  END TAXES 

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LVL 8
rgranlundAsked:
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hieloCommented:
just call toFixed(2);

// START TAXES
 		if( state_a == 'WA') {
 			tax = .0011;
 		} else if ( state_a == 'NJ' ) {
 			tax = .009;
 		} else if ( state_a == 'WV' ) {
 			tax = .0055;
 		} else {
 			tax = 0;
 		}
 		
 		var sub_p_t = parseFloat(final_premium_total) * parseFloat(tax);
 		
 		var round_sub_p_t = Math.ceil(sub_p_t * 100) / 100;
 		
 		var pre_tot = parseFloat(final_premium_total) + parseFloat(sub_p_t);
 		
 		if( state_a == 'WA') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );
 			$(".tax-display").html('(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');
 		} else if( state_a == 'WV') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );
 			$(".tax-display").html( '(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');
 		} else if( state_a == 'NJ') {
 			premium_total = Math.ceil(pre_tot * 100) / 100; 
 			$('[name="item_options[0][surcharge]"]').val( round_sub_p_t );	
 			$(".tax-display").html( '(<strong>Tax Included</strong><span class="sale_price pull-right"><span class="cart_total">$ '+ round_sub_p_t +'</span></span>)');		
 		} else {
 			premium_total = final_premium_total;
 		}

                premium_total = premium_total.toFixed(2);
 	//  END TAXES 

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http://www.w3schools.com/jsref/jsref_tofixed.asp

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quizwedgeCommented:
If you're fine rounding to two decimal places, you can use toFixed. For example,
premium_total = final_premium_total.toFixed(2)

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This will also convert the value to a string. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed for more information.
quizwedgeCommented:
Looks like hielo beat me to submitting. :)
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