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1)))
100%___639.2
3.4%____x
X = 3.4%×639.2/100%
X = 21.73
2)))
100%____9.32
45%____x
X = 45%×9.32/100%
X = 4.19
3)))
100%___7351
86%___x
X = 86%×7351/100%
X = 6321.9