Question: 正泰电器从2025年08月03日到2025年10月24日，收盘价小于20日简单移动平均线的天数比例是多少？（单位：%）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: SMA_n = 1 / n * \sum_{i=0}^{n-1} P_{t-i}
Data:
date,close,low
2025-07-08,23.37,22.88
2025-07-09,23.1,23.05
2025-07-10,22.97,22.95
2025-07-11,23.0,22.96
2025-07-14,23.15,23.01
2025-07-15,22.86,22.8
2025-07-16,22.59,22.55
2025-07-17,22.78,22.61
2025-07-18,22.68,22.58
2025-07-21,23.18,22.68
2025-07-22,23.6,23.12
2025-07-23,23.23,23.2
2025-07-24,23.44,23.19
2025-07-25,23.31,23.26
2025-07-28,23.39,23.12
2025-07-29,23.5,23.05
2025-07-30,23.22,23.08
2025-07-31,22.75,22.71
2025-08-01,22.81,22.75
2025-08-04,22.73,22.56
2025-08-05,22.93,22.73
2025-08-06,22.9,22.86
2025-08-07,22.8,22.68
2025-08-08,23.31,22.77
2025-08-11,23.5,23.11
2025-08-12,23.65,23.35
2025-08-13,23.59,23.48
2025-08-14,23.29,23.25
2025-08-15,24.35,23.29
2025-08-18,24.55,24.21
2025-08-19,24.21,24.12
2025-08-20,24.3,24.0
2025-08-21,24.22,24.13
2025-08-22,24.33,24.1
2025-08-25,24.74,24.28
2025-08-26,25.48,24.58
2025-08-27,25.33,25.28
2025-08-28,27.86,26.59
2025-08-29,27.41,27.15
2025-09-01,27.9,27.49
2025-09-02,27.13,26.81
2025-09-03,28.2,26.9
2025-09-04,27.72,27.35
2025-09-05,28.98,27.5
2025-09-08,28.43,28.06
2025-09-09,27.87,27.7
2025-09-10,27.66,27.31
2025-09-11,28.57,27.7
2025-09-12,27.91,27.86
2025-09-15,27.78,27.6
2025-09-16,27.61,27.13
2025-09-17,28.13,27.36
2025-09-18,27.93,27.58
2025-09-19,27.97,27.65
2025-09-22,27.42,27.19
2025-09-23,28.19,27.23
2025-09-24,28.46,27.61
2025-09-25,28.93,28.21
2025-09-26,29.09,28.71
2025-09-29,29.41,28.68
2025-09-30,30.71,29.21
2025-10-09,32.16,31.02
2025-10-10,30.98,30.7
2025-10-13,30.21,29.38
2025-10-14,29.94,29.73
2025-10-15,30.2,29.46
2025-10-16,30.64,29.83
2025-10-17,28.68,28.5
2025-10-20,28.7,28.51
2025-10-21,28.96,28.59
2025-10-22,28.84,28.39
2025-10-23,28.7,28.11
2025-10-24,29.11,28.81

Indicator data:
date,20日,close
2025-08-04,23.083000000000002,22.73
2025-08-05,23.061,22.93
2025-08-06,23.051,22.9
2025-08-07,23.0425,22.8
2025-08-08,23.058,23.31
2025-08-11,23.0755,23.5
2025-08-12,23.115000000000002,23.65
2025-08-13,23.165,23.59
2025-08-14,23.1905,23.29
2025-08-15,23.274,24.35
2025-08-18,23.342499999999998,24.55
2025-08-19,23.373,24.21
2025-08-20,23.4265,24.3
2025-08-21,23.4655,24.22
2025-08-22,23.5165,24.33
2025-08-25,23.584,24.74
2025-08-26,23.683,25.48
2025-08-27,23.7885,25.33
2025-08-28,24.044,27.86
2025-08-29,24.273999999999997,27.41
2025-09-01,24.5325,27.9
2025-09-02,24.7425,27.13
2025-09-03,25.0075,28.2
2025-09-04,25.2535,27.72
2025-09-05,25.537,28.98
2025-09-08,25.783499999999997,28.43
2025-09-09,25.9945,27.87
2025-09-10,26.198,27.66
2025-09-11,26.462,28.57
2025-09-12,26.639999999999997,27.91
2025-09-15,26.801499999999997,27.78
2025-09-16,26.9715,27.61
2025-09-17,27.163,28.13
2025-09-18,27.3485,27.93
2025-09-19,27.530499999999996,27.97
2025-09-22,27.664499999999997,27.42
2025-09-23,27.8,28.19
2025-09-24,27.9565,28.46
2025-09-25,28.01,28.93
2025-09-26,28.094,29.09
2025-09-29,28.169500000000006,29.41
2025-09-30,28.3485,30.71
2025-10-09,28.5465,32.16
2025-10-10,28.7095,30.98
2025-10-13,28.770999999999997,30.21
2025-10-14,28.846500000000002,29.94
2025-10-15,28.963,30.2
2025-10-16,29.112000000000002,30.64
2025-10-17,29.1175,28.68
2025-10-20,29.157,28.7
2025-10-21,29.216,28.96
2025-10-22,29.277500000000003,28.84
2025-10-23,29.306,28.7
2025-10-24,29.365,29.11

Answer: 79.6296