Consider just this (print and binder cost, not the pagination or cover art work): Pages/4 x .05 + 1 euros for a complete book (B/W internal and color laminated cover).
80/4 = 20

x .05 = 1

+ 1 Eu

= 2Eu Per 80 page Book with colour cover ( what type of binding?)

is that correct? for how many booklets would that be?