a+10%a=1,1a
1,1a+10%·1,1a=1,1a+0,11a=1,21a
a+20%a=1,2a
1,21a 121 1
--------= ---------- = 1-----
1,2a 120 120
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a+10%a=1,1a
1,1a+10%·1,1a=1,1a+0,11a=1,21a
a+20%a=1,2a
1,21a 121 1
--------= ---------- = 1-----
1,2a 120 120