deposit interest – how to calculate

The search function on the forum never works for me so apologies if this question has been raised previously.

I think the real estate agent didnt credit me the full interest on my deposit when I purchased my IP.

I had a 6 week settlement period and payed a 10% deposit of $62k after week one.
This means the the RE agent had the $62k cheque for 5 weeks. I assume it would take them a week to clear the cheque so I the interest on the deposit would be for a period of 1 month.

Just after settlement I recieved a cheque for $41. I was told by the RE agent when exchanging contracts that they invest the deposit and just after settlement they give me 1/2 of the interest and the vendor the other 1/2.

i.e. on $62k invested for 1 month the total interest was $82.

I calculated the interest rate to come to the above figure is about 1.59% which is quite low.

Has someone pocketed some of the interest or is a return of 1.59% normal?

Thanks,
Mark