4. Ms. Anh maintains a savings deposit with VCB Ha Thanh branch. This past year Anh received 10.75 million VND in interest earnings from her savings account. Her savings deposit had the following average balance each month: (in million VND) January 40 July 351 February 25 August 42.51 March 30 September 55 April 15 October 601 May 22.5|November 62.5 June 30 December 30 What was the annual percentage yield (APY) earned on Anh's savings account