we know that 2 liters may be 1.5 to 1.9 rounded up to 2 or 2.1 to 2.4 rounded down to 2
the biggest percent error would be between 2 and 1.5, which is a volume error of 0.5 liters 2 - 1.5 = 0.5 liters percent error = (absolute error / quantity) * 100 percent error = [0.5/2] * 100% = 0.25 * 100% = 25%