If you do not want to consider decimals in the calculation, you can use either Floor or Round function to conver the number to integer as per your requirement.
If you do not want to show the decimals on the chart or table, you may specify it in the Number tab of the Properties window for the object.
You can either use Floor(Value) as FieldName
or Round() function in the script to remove decimal places from the script itself.
Alternatively, you can change the number format in the front end by going to the Object Properties -- Override Document Settings - Number -- and setting it to show Number or Decimal Value (with 0 places) or Money format . But this is ideal only if you have a small number of objects that use your amount field since if there are too many object represeting the money value, changing the number format in the script will be more feasible.
Hope that helps.