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Find the rate of change of total profit, in dollars, with respect to time where `R(x) = 9x` and `C(x) = 0.09x^2+0.9x+60`, when `x=49` and `frac(dx)(dt)=25`.
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Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity
-18.00
Box 2: Select the best answer
dollars per day