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Raphael paid $660 for a camera during a 20% off sale. What was the camera's regular price?

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[tex]x-regular\ price\\\\100\%-20\%=80\%\\\\80\%x=660\\\\0.8x=660\ \ \ \ \ \ |:0.8\\\\x=825\\\\Camera\ costs\ \$825\ before\ sale[/tex]

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