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3% · 1000 +100% · 5 = x% · (1000 + 5)
3/100 · 1000 + 100/100 · 5 = x/100 · (1000 + 5) / · 100
3 · 1000 + 100 · 5 = x · (1000 + 5)
3000 + 500 = x · 1005
x · 1005 = 3500 / : 1005
x = 3500/1005
x ≈ 3,5 [%]