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Explanation
We are given the following:
[tex]\begin{gathered} A=145N+750 \\ B=485N \end{gathered}[/tex]We are required to determine the total amount (P) saved using both plans combined.
This can be achieved thus:
[tex]\begin{gathered} T=A+B \\ T=(145N+750)+(485N) \\ T=145N+750+485N \\ T=145N+485N+750 \\ T=630N+750 \\ T=30(21N+25) \end{gathered}[/tex]Hence, the answer is:
[tex]T=30(21N+25)[/tex]