Should be lower right ? Because the 20k is deposited in mid month and not on 1 AprIf your ADB for Mar is $8.5K, this 8.5K will only earn 0.05% in the esaver for Apr and May. If you put in your $20K, this will be the new fund earning 3.80% starting now till end May. I simplify calculation to be per annum.
(8500*0.05%+20000*3.8%)/28500 = 2.68%.
May also compared with ADB for Mar and not Apr. That's the beauty of putting in scb.