Question 248223
Substitute C the  two dollar amounts
and solve them
C=0.25(t-600)+$61.95
$110.45 and $134.70
let l=low time
and h=high time
11045=0.25(l-600)+6195
13470=0.25(h-600)+6195
Now solve the two equations separately for l and h and those will be low and high times