Answer:
The initial temperature is 80 °F.
The final termperature is 20°F.
During this period, fell 60 °F which represents a percentage of
[tex]\frac{60}{80} \times 100= 75\%[/tex]
We repeat the process for the rest.
From -13 °F to 9 °F, the temperature arose 22 °F, which is equivalent to
[tex]\frac{22}{13} \times 100= 169.23 \%[/tex]
From -5 °F to 8 °F, the temperature fell 13 °F, which is equivalent to
[tex]\frac{13}{5} \times 100= 260 \%[/tex]
