Exchange rate issue in iExpense

Issue:

Exchange Rates differ when rates are changed at expense detail level in Oracle iExpenses module.

Steps followed.

1. create an expense report. for cash based expenses, enter date and expense type and click on details.

Change the currency from GBP to EUR and the exchange rate by default correctly displays as 1.418. However its an editable field and the end user can change accordingly.

If I’m entering a specific exchange rate it does some unusual things:

If I enter

1.4 it changes it to 1.400000001

1.5 it changes it to 1.499999999

1.8 it changes it to 1.799999999

1.9 it changes it to 1.900000002

Can you tell me the reason for this.