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Watch: John Oliver Shows Us How Donald Trump Is Bad At Math

We all enjoy laughing at Donald Trump's antics, but we shouldn't forget that the billionaire business mogul is the Republican front runner for the presidential nomination. That's why the latest episode of John Oliver's "Last Week Tonight featured a serious (well, serious-ish) discussion of Trump's plan to build a 30+ foot wall between America and Mexico.

Trump claims that the wall will cost $12 billion to build. But Oliver estimates that the price tag will be more than twice that ($25 billion) without taking maintenance costs into account. "It's a big dumb thing that only gets more expensive all the time," the comedian quips.

Oliver debunks the idea that the Mexican government will pay for the wall, and he pitches a new career for retired quarterback Peyton Manning: helping Mexican drug cartels throw baggies of marijuana over the Trump wall.

Check out the full video here:

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