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A2=65
X1=72,5%
X2=27,5%
m at. = A1*X1% + A2*X2% +... +An*Xn/100%
m at. = 63*72,5 + 65*27,5/100
m at. = 4567,5 + 1787,5/100
m at. = 6355/100
m at.=63,55u