why doubling your money after 2 years wouldnt be 50% IRR

hi in an interview I was asked what IRR would be after doubling your money after 1 and what it would be if doubling ur money after 2 years, i said 100% after 1 year and around 40% after 2 years. the interviewer followed up with if its 100% after one year, why would it not be 50% after two years?

My reply was because of the time value of money the interviewer never said anything after.

I wanted to ask whether my answer was correct or if not, what the correct answer would be?

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