850 from 10th march to 3rd August at 2•5 % p•a. Calculate SI and amount.
You can use a calendar to add up the days (T).
T = 21 + 30 + 31 + 30 + 31 + 3 = 146 days.
I = Po *r *T = 850 * (0.025/360) * 146 = Int.
P = Po + I = Total principal or amount.