Multiplying all pricing formulas by a percentage

I'm building a pricing formula for a product with many lines. I'd like to take the total of everything above and multiply it by 20%. Can I?

No, there's no variable or anything special for that - but you instead of combining them all into one formula box you could just multiply each complete formula by 1.2 to increase them all individually by 20% before they are added together [I just checked the math on this :) and I'm getting the same values whether or not I add several numbers together and then increase by 20% or increase each by 20% and then add together]