I got the invite for 2.8% too. I managed to recompute my interest, so I think this is how it is calculatedI got an email invite for the 2.8 percent promo rate, the oct base interest and promo interest credited to my account, but the promo int rate credited is only at around 1 percent?
Not sure how they are calculating the interest for this round of promotion. Usually the promo int rate is credited in during middle of the following mth but this time they seem to credit part of it at the end of the mth (oct) and possibly the rest in the middle of the following mth (nov)
The oct bonus interest relates to the current 1.95% interest on incremental bonus applicable to all. You need to calculate the (Oct ADB minus Sep ADB) x 1.95%. ADB calculated as the summation of daily balance in the mth divide by 30 or 31.
I don't think the 2.8% for oct ADB is credited yet.