Answer :

[tex]4\%=0.04\\\\0.04(2a+b)=18\ \ \ \ /:0.04\\\\2a+b=450\\\\the\ greatest\ possible\ value\ of\ b\ if\ a=1:\\\\2\cdot1+b=450\\2+b=450\\b=450-2\\b=448\leftarrow answer[/tex]

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