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5/4000 = 125/1000 = 1,25 promila
(np. 1/2000 to oczywiście ułamek jedna dwutysięczna ;)
b) 1,25promili
1÷2000×1000%o=0.5%o
b.
4 litry→4000ml
5÷4000×1000%o=1,25%o