Respuesta :
if she gets charged 4 cents per minute. if she talks for 15 minutes, that means it costs 60 cents.
If she gets charged 4 cents for every minute and you talk for 15 minutes, that means that you would pay 60 cents. But you can be charged at minimum 75 cents, so that means you would pay 75 cents. You would then divide that 75 cents by the 15 minutes, and you would get 5 cents per minute.