Java code-how to waive shipping rate of $10 if subtotal before tax's above $39 and shipping rate remains if below $40

Question

<br />
<div class="cart-summary">
Sub Totals: <span class="simpleCart_total"></span>
<br />
Tax: <span class="simpleCart_tax"></span>
<br />
Shipping: <span class="simpleCart_shipping"></span>
<br />
<b>Grand Total: <span class="simpleCart_grandTotal"></span></b>
<br />
<br />
</div>
// flat rate shipping option
shippingFlatRate: 10,

taxRate: 0.07,

taxShipping:true

Answer 1

java or JavaScript

Answer 2

Unfortunately I'm new to this, so I'm not quite sure actually. This code is meant to be inputed in blogspot.