This is a fairly simple outline:
Suppose your typical product (or bundle) has VARIABLE costs of €150
And you Sell for €200
Then you get a 'contribution' of (200-150) = €50 per bundle to Fixed Costs and Profit.
Fixed Costs (say) €5,000.
Desired Profit Nil (to see break even first)
€5,000 divided by €50 = 100 bundles you must sell to break -even
Profit (required say) €10,000.
Required Contribution (5,00+10,000) = €15,000 divided by €50 = 300 bundles.
Suppose you know you will ONLY sell 200. And you want the €15,000 'contribution'
Then €15,000 divided by 200 = €75 contribution per bundle.
Sale price (variable per unit plus contribution per unit) 150+75 =€ 225
(This is a really short summary - key is some costs vary with sales - others don't)