Liquid leaked from a damaged tank at a rate of r(t) liters per hour. The rate decreased as time passed and values of the rate at five-hour time intervals are shown in the table. t (hr) r(t) (L/h) 8.6 5 8 10 7.4 15 6.8 20 6.3 25 5.9 Find lower and upper estimates for the total amount of liquid that leaked out.

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