Plz help me with printing costs !! its a hard one for me

I have Canon imagerunner advance c3520i , Toners C-EXV 49 TONER BK: 36,000 pages 50 euros and C-EXV 49 TONER C/M/Y: 19,000 pages 80euros each. Can someone tell me the average toner cost of an A4 photo print one side of the paper (for example 80% coverage that most photos have)?

 

But toners is not only consumable in your machine. How about Fuser? How about imaging units? What is their life span and cost?
That toner yield you had provided is calculated with 5% coverage - industrys accepted standatd same for every manufacturer, you will never ever get that amount of prints out of your toners unless printing something like letterheads.