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masa = 40 + 2 × 16 + 2 × 1 = 40 + 32 + 2 = 74[u]
74u --- 100%
40u --- x%
32u --- y%
x = 40 × 100 : 74
x = ?
y = 32 × 100 : 74
y = ?
100% - x% - y% = % masowy H