How do ambitious writers in sims 3 get a raise?

Sims 3 Ye Xin writers are freelancers. They earn money by writing royalties, but they can't get a raise. They can only write more books. As for the final income of books, take fairy tales as an example. Each book lasts about 2 hours, and the royalty is 600, which lasts for 6 weeks, which is equivalent to the weekly income of about1.5w.

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