The interest for each method will be:
The Previous Balance Method will be:
= PTR
= 3000 × (1/12) × 0.15
= $37.50
The Adjusted Balance Method will be:
P = 3000 - 50 = 2950
t = 1/12
r = 15% = 0.15
I = 2950 × (1/12) × 0.15
= $36.88
The Average Daily Balance Method will be:
= (3000 × 10) +(2950 × 20)/30
= 89000/30
= $2966.67
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