, 5.1, 5.2a Part 1 of 6 X A tank is leaking at an increasing rate as indicated by the data below. Use the table to answer the following questions. Time (hr) 0 1 2 3 4 5 6 7 8 Leakage (gal/hr) 30 50 150 240 330 410 550 640 720 An upper limit estimate for the amount of material leaked after 4 hours is gal. (Simplify your answer.)