Ca coute combien ? you are deciding whether or not to buy it. Ca fait combien ? you've bought more than one item, and want to know the total.
Combien coûte le crayon ?
Combien coute un cola?
cela coûte trop cher.
combien ca coute
combien coûte le musée ?
Au coût
You say, "Au prix coûtant"
le coût - coûter
how much is 'combien' in French. Depending on what you have after we say combien? or combien de... How much money? Combien d'argent?
It cost 1.75
2.30
Euros are the french currency, so you would say Ca fait combien? (How much does that make?) or c'est combien? (How much...?) the response would be: Ca fait ___ euros. (It makes ___ euros) or C'est ___ euros (It's ___ euros).