Foreign currency issue on Invoice

I am having an issue with foreign currency on sales invoice.
I have created an invoice with an amount of 8000.41 USD. After calculation of VAT 15 % ,theGrand total amount is 9200.47 USD. Now when convert the amount to MUR,the amount in MUR is incorrect.The amount should be Rs 361578.52 and on system it is 361578.47.there is a difference of 0.05995.See below snap shot:

Below is the set up for currency:

Can you please Advise