"This lunch costs sixty nine hryvnyas."
Translation:Цей обід коштує шістдесят дев'ять гривень.
As a modifier, цей behaves as an adjective and should reflect the gender/number of the noun it modifies. «Обід» is a masculine noun, hence цей, whereas це would be used for neuter.
Indeclinable це is also used independently in "This is" sentences and as an abstract "it / this / that" ("We finished the job. And this is good"). It is also used in sentences like «Кінь — це тварина» (mainly when you define one concept through another concept).