Calculus question, PLEASE HELP WITH THIS, due tonight!! Use the graph of the function f(x) to answer each question. Use ∞ , -∞ or DNE where appropriate. Explain if DNE.
(I will give 60 additional points and a brainliest if answered properly, thank you so much) WILL BAN IF AN ABSURD ANSWER!!!

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck