Respuesta :
4000 divide by 160 to get the cost of each book
4000 / 160 = 25
So that's £25 per book, multiply that by two because they gave two away which is £50 so they lost £50
4000 / 160 = 25
So that's £25 per book, multiply that by two because they gave two away which is £50 so they lost £50