PLEASE HELP FAST!!!!!!!!!!

Question

A food truck sells 100 hot dogs each day when it charges $2.00 per hot dog. For a $0.25 decrease in price, the food truck sells 25 more hot dogs.

a.  How much should the food truck charge to maximize daily revenue?

The food truck should charge $ per hot dog.

b. What is the maximum daily revenue?

The maximum daily revenue is $. 

Answer 1

a. The food truck should charge 1.75 for hot dog 1.75 * 125 > 2.00 * 100

b. Maximum daily revenus is $1.75*125 which is $218.75

Answer 2

R(x) = (100 + 20x)(2.00 - 0.25x)