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During autumn, the daily profit of a pumpkin farm is dependent upon the daytime high temperature, as shown in the graph.
Between which temperatures is the daily profit increasing?
Pumpkin Farm Profits
Daily Profit (in $1000s)
0
20
30
40
50
Temperature (in °F)
60
70
A from 20 °F to 60 °F
© from 50 °F to 70 °F
' (B from 40 °F to 70 °F
D from 60 °F to 80 °F