In the in-game shop you can purchase permanent increases to your income - these will give you increased profits in your restaurant without you needing to do anything else. Both of these boosts stack together for a total of 100% boost if you purchase them both. The two available boosts are:

Small Profits Boost - gives a 30% increase
Large Profits Boost - gives a 70% increase

You will see the effect from your Profits Boosts on your Statistics page. The x2 Ad Boost will take precedence over your Profit Boost while active.