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persentase 11 B = (100-x)%
10,81 = 10. (x/100)+ 11. (100-x)/100
10,81 = 10x/100 + (1100-11x)/100
semua di kali 100 maka menjadi
1081 = 10x + 1100-11x
1081-1100 = 10x-11x
-19 = -x
x. = 19
maka persentase 10B = x%
= 19%
persentase 11B = (100-x)%
= ( 100-9)%
= 81%