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As the object is granola bars hence it may start from 0 and it ends at 300
Hence
Domain:-
[tex]\\ \sf{:}\dashrightarrow 0\leqslant x\leqslant 300[/tex]
And
[tex]\\ \sf{:}\dashrightarrow 0.75(300)=225[/tex]
Hence
Range:-
[tex]\\ \sf{:}\dashrightarrow 0\leqslant y\leqslant 225[/tex]