Problem in adding the Numeric Fields in Adobe Designer



On an Adobe Form, I have 2 Numeric Fields with the following details:

Data Format:Decimal

Display Pattern: zz9.99

Filed Type is Numeric


If I add 1.46 + 74.24, instead of returning 75.7 it is giving me the value of: "75.6999999"

The addition is posing problem for only certain values, it is giving me proper sum if i change the values to 1.44 and 74.26 etc.

Please explain why the addition is returning wrong results in case of 1.46 & 74.24.