The demand for snoofs is found to be Q = 1000 - 12Ps - 5Pt + 0.

The demand for snoofs is found to be Q = 1000 - 12Ps - 5Pt + 0.4Y, where Ps is the price of snoofs in dollars , Pt is the price of toofs in dollars, Y is income in thousands of dollars and Q is quantity of snoofs in thousands. Currently, Ps =40, Pt = 30, and Y=30. If the Snoof Company wanted to maximize REVENUE, what price would they set? Please use up to two places after the decimal in your calculations.

$71.80

$43.40

 $40.00

 $35.90

What is the answer to this? I thought it was $40, but I am not sure where to go after multiplying each factor (12x40, 5x30, .4X30)?