[(1.0, [1.0, 1.1]), (1.2, [1.2, 1.3]), (1.4, [1.4, 1.5]), (1.6, [1.6, 1.7]),
    (1.8, [1.8, 1.9]), (2.0, [2.0])]
In Python, how can I check if 2 numbers in a list are within a certain percentage of each other?