Answer:
The answer is 0.36b
Explanation:
b-0.4xb=b-0.4b=0.6b
0.6b-0.4(0.6b)=0.6b-0.24=0.36b
result is 20%
initially B was 100%
therefore 100% - 40%
=60% remaining
60% - 40%
= 20%
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