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# Help with recurrence relations- Higher Maths watch

1. Been given this question for homework and not sure how to do it:
2. This is a simple compound interest problem, simply take the percent change (in decimal form) so in this instance it would be 1.09 for 9% then raise this to the power of how many years have passed. So 1.09^(18-13) = 1.09^5 this will yield the total percentage increase of the lump sum.
3. (Original post by Bernie2016)
This is a simple compound interest problem, simply take the percent change (in decimal form) so in this instance it would be 1.09 for 9% then raise this to the power of how many years have passed. So 1.09^(18-13) = 1.09^5 this will yield the total percentage increase of the lump sum.
Thank you so much! Was given on recurrence relation homework sheet and worth 4 marks so I assumed it would have been more complex

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