已知环比增长速度为5.6%. 7.1%. 8.5%. 6.4%，则定基发展速度为( )。
5.6% ×7.1%×8.5% ×6.4%
(105.6% ×107.1% ×108.5% ×106.4%) -100%
(5.6% ×7.1% ×8.5% ×6.4%)-100%
105. 6% ×107.1% ×108. 5% ×106. 4%
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