add a sum to minum price AFTER formula

I use Uni CPO to calculate the price of mosquito nets. Price is calculated using square meters surface, with a minimum price of 2mq.

My variables ar: colour (that contains for every colour price/mq), width, height, extra option (Yes=12€, no=0€).

So to calculate final price, I added colour*width*height+extra option.

Problem is that if the mimimum area calculated is under 2mq, it obviously doesn’t add the extra option to the minimum billable amount.

Is there any conditional formula to add “even if less of the minimum billable account, add the extra option”? I was not able to achieve it with conditional rules.