# Applying a coupon code to cart subtotal less any product discounts

Thread began 7/15/2013 7:42 pm by graham | Last modified 7/16/2013 12:19 pm by Jason Byrnes | 609 views | 1 replies |

## 7/15/2013 7:42 pm  |  #1 graham

### Applying a coupon code to cart subtotal less any product discounts

For signing up to our website's newsletter, we issued each customer a unique, one-time use 20% off coupon code. This code can be used in conjunction with any current promos on the site - some of our favorites to offer being "Buy One Get One for Half Price". All functions smoothly, except for one tiny issue ... I would like the 20% off code applied to the cart subtotal less discounts, instead of the cart subtotal alone. If product x is \$16, and we have a BOGO 50% off, 2 total \$24. But, the way I have the formula, the 20% off discount is \$6.40 (.2 times cart subtotal), instead of \$4.80. How can I tweak the formula, Jason?

## 7/16/2013 12:19 pm  |  #2 Jason ByrnesWebAssist

Well, that's a tricky one.

you cant really do a simplistic discount calculation of
[subtotal] - [all discounts] * [amount]

because as soon as that discount is applied the value of [all discounts] will be changed meaning the discount will be recalculated in an endless loop.

instead, you will need set the caculation for the discount to subtract each other discount from the subtotal

For Example, if I have 2 discounts:
Discount 1
Discount 2

i can set Discount 2 to subtract Discount 1 from the subtotal using a flat rate discount and the following code:

(\$this->TotalColumn("TotalPrice") - \$this->GetRuleValueByName('Discounts','Discount 1')) * 0.1

this will give a 10% discount of the Sum of (Subtotal - the value of Discount 1)

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