please explain how to solve these 2 questions. My work is below. Answer in text solution is "12.93" for Q7. But my answer is 12.97.

I don't know where my work was wrong.

Chapter 21 Applications of financial mathematics 563 7 The details of an investment account Debit ($) Credit ($) Total ($) are as shown. How much interest has been earned on this account if the bank pays simple interest of 3% per annum on the minimum daily balance? Date Opening Balance: 1 July 8 August 10 December 400.00 350.00 500.00 900.00 1250.00 Closing Balance: 31 December 1250.00 8 Andrew receives a statement from the bank that gives the detail of his investment account from 1 November until 31 December. The details are as shown. How much interest has been earned on this account if the bank pays simple interest of 4% per annum on the minimum daily balance? Date Debit ($) Credit ($) Total ($) Opening Balance: 1 November 10 000.00 12 November 4350.98 14 350.98 11 December 2277.44 12073.54 Closing Balance: 31 December 7.8=300 / July Vo=500 8=3% 50013) oo 2 / Lot lian 500 365:31 9 ndays 1-7/8 : Vo = 500 8-31/8 : Vo = 900 5001 31-841-24 E 50017 (00 285 = 0.2817 0.29 100 200.25 24 990.22 Pos 1.07 (0o 0.29 +1.18 -2.00 Sep Vo=900 900:35:30 32.22 100 Oct 900 . 365:31 & 2,29 00) I Nov 900.2005 30 5 160 Dec 7-14/12 : 900- 0 2,0.94 4-3/2 : (250-B 21 Todays = 2.16 21 days (Oo 29 1.27+ 1.077 2,22 +2.29 + 20227 229 12.99