If you spend €500 on advertising to get €2,250 in sales from 30 orders with an average order value of €75, your ROAS will be 4.5x.

This indicates that for every $1 spent on ads, you earn €4.5 in revenue.

Your ACOS (Advertising Cost of Sale) indicates that 22.2% of your revenue will go to advertising costs. You have an additional 77.8% (€1,750) to cover additional expenses and keep a profit.