What would be the proper responce for "¿Cuánto cuesta una hamburguesa de McDonald's? ¿Cuánto cuestan tus jeans favoritos?"

i would say "están" :

ummmthings that are different in peru than in the united states:

1. granola bars: they are not made of granola. they are made of quinoa and other grains that remind me of the millet i feed my birds at home. they have the texture of styrofoam but are cheap and comparatively healthy.