How calculate percent error for chemistry?

I have a test tomorrow in chemistry and i really want to do well. This is one of our problems on our review sheet. Someone please help me find percent error? Marissa determined the melting poin of a substance to be 24.5 degrees Celsius. Find the percent error of her her measurement if the actual melting point is... show more I have a test tomorrow in chemistry and i really want to do well. This is one of our problems on our review sheet. Someone please help me find percent error? Marissa determined the melting poin of a substance to be 24.5 degrees Celsius. Find the percent error of her her measurement if the actual melting point is 31.2 degrees celsius. Please help? I'm really confused.
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