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b)800.
c)2000.
d)120.
0,5% - 2
0,5x=200/:0,5
x=400
b)100%-x
1,5% - 12
1200 = 1,5x/:1,5
x=800
c)100%-x
0,2 - 4
0,2x=400/:0,2
x=2000
d)100%-x
2,5% - 3
2,5x=300/:2,5
x=120