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Setting up WHMCS promotions - two months off for annual customers

One of our colleagues tried to setup a promotion for our reseller offers as follows.
There are four reseller packages ranging from $7.99/mo to $29.99/mo. What he's basically trying to do is, setup a two month off promotion for annual customers.
We also have monthly option. We only need this promotion to be valid for annual selected customers. They will receive two months free from their reseller package.
Pricing breakdown as follows,
Monthly customer pays $7.99 for Resell Achroite package. Which means he's paying $95.88/yr
Annual customer pay $90.99/yr for Resell Achroite package. When he applies this promotion code, his price should be $75.82/yr. He gets a $15.16 off, which means two months from his package is waived off.
We can set price override, but thing is. There are four packages. If we setup $15.16 override and change Achroite package price to be 75.82$. It's not a issue, but when it comes to Resell Bixbite package, monthly price is $12.99. His two months off price will vary from others.
Can anyone suggest me a idea how to setup this promotion.
Comments
Select percentage , instead of override or make separate promotions for each or hire someone to manage your whmcs.
The thing is, there will be four different coupons. We only need to setup one
BTW- I'm not the one who managing whmcs.
This cannot be done because of simple maths
Selecting percentage and giving thema a 16.66% discount would work for me
Did it. But when selecting addon and other stuffs, this broke the promotion apart. Anyway, got it fixed by hooking a little script to whmcs core.
Thank you guys for your help