This extension allows the admin to set the special price % discount on options, as it is on the price.

Admin(Catalog->Products->Edit product->Special tab:
1. See your special offer discount in % next to the price.
2. Live update of the % on special price change.
3. Live update of the % on the actual price change(data tab).
4. New selectbox: "Apply on options" with Yes/No choices.
5. The "Apply on options" can always be reset.

On the Client(product page):
1. Check the "Apply on options" choice.
2. If true, apply the % discount for every option(before tax application).
3. Add a message to inform the client about your big special price discount being applied on the options also.
4. See the new calculated total price on the cart.

Demo:
http://opencart-ext.tk/v1index.php?route=product/product&product_id=42

Admin:
http://opencart-ext.tk/v1k/admin/
user:demo
pwd:demo

OR Alt + A from the store

If you need the Discount to be applied for a sum please check my other extension:
Special Discount for Options Total(vqMod)


For any ideas/suggestions/bugs/questions do not hesitate to make a comment, it will be highly appreciated and quickly fixed!