How could

How could checkio([120, [3, 10]]) be 109 and checkio([120, [120, 10, 122, 2, 10, 10, 30, 1]]) be 56 ?

120 - 3 * 1.01 - 0.5 = 116.47 => floor(116.47) = 116 116 - 10 * 1.01 - 0.5 = 105.5 => floor(105.5) = 105

and

120 < 120 * 1.01 + 0.5 120 - 10 * 1.01 - 0.5 = 109.4 => floor(109.4) = 109 109 < 122 * 1.01 + 0.5 109 - 2 * 1.01 - 0.5 = 106.48 => floor(106.48) = 106 106 - 10 * 1.01 - 0.5 = 95.4 => floor(95.4) = 95 95 - 10 * 1.01 - 0.5 = 84.4 => floor(84.4) = 84 84 - 30 * 1.01 - 0.5 = 53.2 => floor(53.2) = 53 53 - 1 * 1.01 - 0.5 = 51.49 => floor(51.49) = 51

Am i wrong?