Roberto purchased airline tickets for his family of 4. the tickets cost $1,250. the airline also charged a luggage fee, bringing the total cost to $1,400. what is the percent increase in the cost due to the luggage fee?

Will mark brainliest for correct answer! i have been on this problem for an hour and can't find the answer. i'm begging here! incase you cant read the instructions in the picture because of too much or too little lighting: note: enter your answer and show all the steps that you use to solve this problem in the space provided.write a list of steps that are needed to find the measure of b. provide all steps as clear as possible, !