Show your work: Please click the "Show Work" button and type your step-by-step work, including the equations, plugging the data, calculations, results and conclusions. If no work is shown, you will receive zero credit for this question. Clara designed the system above with her engineering team. (a) The overall system reliability is % (enter your response as a percentage rounded to two decimal places). (b) If they have to pay $3,800 to fix a failed system, what is the expected failure cost of the system? \$ (round your response to the nearest dollar). (c) If Clara wants to add a(n) 70\%-reliable backup to R4, how much should they pay for the backup at the maximum? \$ (round your response to the nearest dollar)