Almost every Spaniard. As there are 46.5 million Spain population, I would say 46.5 million (or the closest to that)
Cuanto cuesta means "how much does it cost" and the best choice would be "cuanto es" which means "how much is it"
Ser específico
Ser ordenado
Ser claro
Ser explícito.
Disculpe Señor, ¿Puedo tener el "San Remo Dip" para el aperitivo y me gustaría tener Fettuccine Alfredo para la comida.