Small fries at McD had been lately around 2,99 EUR, that was very expensive given that the "small fries" are actually really small :-D
In the US, a rule of thumb for restaurant economics is that only about 25-35% of an item's price is the cost of ingredients, when you average over all menu items (of course some items better margins than others). The rest goes into labor, fixed costs, etc. It varies a bit by region and by market segment (e.g. fast food vs fast casual vs fine dining), but not by too much.
Japan: McFry S Size ¥ 200~ (1.09 EUR) M Size ¥ 330~ (1.80 EUR) L Size ¥ 380~ (2.07 EUR) * Prices may differ at selected restaurants and for delivery.
Most of it is probably labor, marketing & franchise fees, rent, utilities, and equipment depreciation. Raw ingredients are likely 5-10%.
They’ve been driving people to use their app for years now. The menu prices isn’t what one pays if they use the app, since it has a constant stream of coupons and discounts that bring the list price down.