Mary saves for a holiday each year. In 2020 she saved a total of $$\(\$ 720\)$$ In 2021, each month she saved $$\(\$ 78\)$$ The total amount Mary saved in 2021 was $$\(P \%\)$$ more than the total she saved in 2020 (a) Work out the value of $$\(P\)$$ (4)

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