I would imagine that it was worth 500 marks!
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10000 nickels would be worth: $500
It would be worth 500*(1 + 06*4) = 620
500 Dollars maybe
The sum you need is: 500 * 0.05^6. (Obviously, this sum gives "how much money you will have", not how much it will be worth, since inflation or other factors are not taken into account).
$500 x (1.09)4 = $705.79 (rounded)