[Bugs] #1713 UNSP: Calculate-30 - result (im)precision can confuse user

[Sugar Labs Bugs]

#1713: Calculate-30 - result (im)precision can confuse user
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    Reporter:  mikus                                              |          Owner:  rwh                        
        Type:  defect                                             |         Status:  new                        
    Priority:  Unspecified by Maintainer                          |      Milestone:  Unspecified by Release Team
   Component:  Calculate                                          |        Version:  0.84.x                     
    Severity:  Unspecified                                        |       Keywords:                             
Distribution:  Other (name your distribution in the description)  |   Status_field:  Unconfirmed                
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 Used calculate (on XO-1.5 running build os109) to multiply a value that
 started out as an amount in dollars and cents.  Although with paper and
 pencil this particular calculation comes up with an EXACT answer, the
 result shown by Calculate had (IMHO unnecessarily) to be mentally rounded
 by the user to get the answer he expected.

 I don't mind if the Activity's default answer is carried out to additional
 decimal places.  But to be given an answer in the form of .xx399 (when the
 PRECISE result would be .xx400) is confusing.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1713>
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