**compro_1975** wrote:
hmmm where in my formula is wrong?

=((((((70/100***1.77**))/100)/365)***AvgMonthlySum**)*30)

my formula is same as yours .... 150k got $157.35 Base interest

any of your days where the balance is less than 70k or more than 150k ?

also check your ADB ...

did you mix up the Base & Bonus amount ?

as another check from this site, all Apr's available Sibor was above 1.82% so it is highly unlikely to be 1.77%

https://sibor.sg/history.html