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a=130%b
a=1,3b
100%*(a-b)/a =
=100%*(1,3b-b)/1,3b =
=100%*0,3b/1,3b =
=100%*0,3/1,3 =
=30/1,3% =
=300/13 5 = 23 1/13 %
1,3 b - b = 0,3 b