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Answer

Answer would option 5: 10.24 Meters Height H = 20. After each bounce it reduces to 80% Therefore final height after the first bounce would be : 20 * (80/100) = 20 * 0.8 = 16 Meter and hence similarly height after 2nd bounce would be : 16 * 0.8 = 12.8 Meter and similarly height after 3rd bounce would be : (12.8 * 0.8) = 10.24 Meter