Can I replace "roughly" with "about" here?
Yes. You absolutely can switch "roughly" and "about. Both words are ways of saying approximately and in everyday speech you will hear people use these two interchangeably. I would say there's no real rule about this. It's perfectly acceptable to use any of these, according to personal preference. They mean exactly the same thing. Ex: He's roughly two years older than me. Ex: He's about two years older than me. Ex: It costs roughly $50. Ex: It costs about $50.
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