Seems an odd question but maybe the issue is both 40%s?
If the answer is 7600 then I believe in effect the OP is saying
He needs 40% of the total of A and B, but that B itself is included at 40% in the initial calculation.
So (A + 0.4 B)*0.4
At least thats how I take the wording to mean if the answer is 7600.
But I am not 100% convinced thats the correct end result from what the OP wrote.
The same conclusion could be had by 0.4 A + (0.4x0.4 =0.16)B
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