A thermometer can be read to an accuracy of $ \pm {\text{ }}0.5^\circ C$. This thermometer is used to measure a temperature rise from $40^\circ C{\text{ }}to{\text{ }}100^\circ C$.
What is the percentage uncertainty in the measurement of the temperature rise?
1 )
0.5%
2 )
0.8%
3 )
1.3%
1.7%
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