error: unsupported operand type(s) for *: 'Decimal' and 'float'

Hello..

I again.....now my problem is:

I have the function following: http://paste.pocoo.org/show/224041/

These values i get of a form...however returns me an error....fallows
below the error

Exception Type: TypeError
Exception Value: unsupported operand type(s) for *: 'Decimal' and
'float'

Exception Location: C:\simuladores\..\simuladores\detector\views.py in
graph, line 32

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