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How does GC calculate total points?

Created an assignment with 70 MC items.  All odds are worth 0.2 pts each and all evens are worth 1.0 pt each. Total points possible are 42, but when I scan an assignment, GC comes up with strange decimals. Examples: 32.999999999999986/42.000000000000014 or 35.199999999999996/42.000000000000014 or 42.000000000000014/42.000000000000014

What am I doing wrong? Can I change the number of decimal places GC shows for each students scan? The digits write over the top of themselves and make the percentage grade impossible for me to read.

Please help.  Thank you.

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