How do I convince my dad to let me buy computer games?

I have to go buy a book for honors english,so maybe I want sims2 university too.My dad has games break the computer clogged in his head and I really want uni.I won’t have more than three and 2 exps games on the computer at a time;I have simcity,ageofempires2,and sims2,and opf.I will uninstall simcity if I get uni.Any advice on what I can tell to convince him to let me buy a game.

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