Question about Column Centimeters Newspapers

Hi all,

http://www.silumina.lk/Advt/

Oya link eke Print edition eke ad danakota charge karanne Column Centimers walin kiyanawa. 1 COL = 3 cm
Sri Lankawe all newspapers wala use karanne oyata data da?

Hitamu mata FULL COLOR 30 cm x 9 cm ad ekak danna ona kiyala. 1 Colum Centimeter ekaka price eka Rs. 500.
Etakota mage a ad ekata wenne:
30 cm = 10 COL
9 cm = 3 COL

Total price = (10 x 3) x 500 = 15000

Ohomada price eka wenne?

Mama dannawa specific page, position ekakata dana giyoth price wenas kiyala.
Mama ahanne basic price eka hadanna ohomada?

Thanks