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On his math quiz, Anthony used a protractor to measure an angle. He misread the protractor and thought the angle measured $28 ^\circ$. When he double-checked his work before turning it in, he realized the actual measure of the angle was $32 ^\circ$. What is the percent error for his original measurement? If necessary, round your answer to the nearest tenth of a percent.$\newline$____$\%$