So you're starting with Pounds and ending with Euros....
Is this problem translated from another language?
Are you a student: if so, what grade? Thank you.
You need to CLARIFY that.
Can you ask someone to help you post your problem IN FULL?
As example, what does "It" mean: the 1600 ?, the account in which deposited/invested?
Also, what is intended with "Simple Interest"? No compounding?
Google tells us that a sheet of A4 paper = ~8.27" by ~11.69"
Suggestion:
construct an open-top box by cutting off a square from each corner;
go see here:
https://www.analyzemath.com/calculus/Problems/maximum_volume_problem.html
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