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ROI is a different animal from multiples of face value. Wikipedia explains it very well but there are several formulas requiring specific application.

To apply it simply, it is the gain of the investment ($2.4211, one silver dime, current silver content value used earlier) minus the original investment ($0.10)
divided by the original investment ($0.10).

The resultant formula: $2.4211 - .10/ .10 or…$2.3211/.10= 23.211 % ROI.

@rte used a higher value ($2.54, approx.) to get 24.449 % from post #9.
…Spark

 

Maybe the confusion is % vs X (times). Again, not a math expert. A great find no matter what the gain is. Nice!

 

Except you need to multiply by 100 to express it as a percent. If I invest $1000 and after a year have $1100, 100/1000 = 0.1. Obviously I did not earn 0.1% on that, I earned 10%. OP's ROI is 2321%. Per that Wikipedia entry: "Return on investment (%) = (current value of investment if not exited yet or sold price of investment if exited + income from investment − initial investment and other expenses) / initial investment and other expenses x 100%."

 

You are correct. The formula I used neglects to mention expressing as a percentage you must multiply by 100.

The Wikipedia article needs editing to clarify the formula and its’ specific application…Spark

 

The final total based on rough grading....
Drum roll please.....

$616 after sorting out two rolls that had mixed clad and silver coins in it. Not bad for paying $30 for the 6 rolls at face value.

 

Yeah! More money for the Xmas fund.