Celeste has $40 that she plans on using to pay for lunch with a friend, including the tip. she always tips 16%. what is the maximum amount celeste can spend on the food, so she can be sure to have enough money remaining to cover the tip? round to the nearest cent.

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min