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X-0,5‰
X= 38000000*0,5/1000= 19000
0,5‰-2
1000‰-X
X=1000*2/0,5=4000
150000-1000‰
30-X
X=30*1000/150000=3/15=0,2
0,05‰-X
1000‰-100%
X= 0,05*100/1000=0,005%