How to simulate the calculation of interest and fees for Honest Savings?

The interest rate for Honest Savings is 4% per year, calculated from the amount of money you deposit. This means the larger your deposit, the more interest you can earn!

Interest is calculated daily based on your balance over a certain period:

• If you deposit between the 1st and 15th, interest will be paid on the 16th of the same month.
• If you deposit between the 16th and 30th, interest will be paid on the 16th of the following month.
• A 20% tax deduction will be applied to the 4% p.a interest you receive.

Example for interest disbursement date:

Suppose you deposit Rp10,000,000 on the 1st, with an interest rate of 4% p.a.

• Daily interest = (Rp10,000,000 × 4%) ÷ 365 = Rp1,095 per day
• If you keep the deposit from the 1st to the 15th (15 days): 15 × Rp1,095 = Rp16,425 gross interest
• After a 20% tax deduction from the interest: Rp16,425 × (1 – 0.20) = Rp13,140 net interest

‍Note: In a leap year, the calculation uses 366 days as the divisor, not 365 days.How to simulate the calculation of interest and fees for Honest Savings?