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2014-03-20T18:30:57+01:00
Ex 5 :
a)20*0,6 = 12
b)25*0,44 = 11
c) (12+11)/(20+25) = 23/45 = 51%

ex 6 :
(2500*0,55+2800*0,49)/(2500+2800) = 52%