MTA boss Janno Lieber didn’t seem to remember how much a monthly MetroCard costs Tuesday as he claimed commuters are “loving the benefit” of the potentially more expensive tap-to-ride system.

The decades-old MetroCard system will officially vanish by year’s end, to be fully replaced by the pay-as-you-go OMNY system.

“You don’t have to have $100 bucks in your pocket to pay for a monthly,” the transit agency’s CEO said on WNYC’s The Brian Lehrer Show — even though a month unlimited actually costs $132.

OMNY is flexible but caps weekly charges at $34 — which could total $1,768 for a year — or nearly $200 more than a current unlimited pass costs.

“People are loving those benefits,” Lieber bragged about the new program, which was riddled with software bugs at launch.

Two MTA spokesperson

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