3. You presented your results during the next company meeting. However, the company's financial consultant noted that you failed to take into account the operation cost of the evacuation chamber given in the graph below. The CEO asked you to find the optimal thickness which would minimize the overall cost given the cost of evacuating the oxygen while making sure that the oxygen pressure should still be reduced by a half. What is the new optimal thickness? What is the calculated cost at this thickness? (: 5 4 cost (PHP) N y = 0.1538x + 3 R? = 1 0 0 5 10 time (hours)