CPF Compound Interest

Hello, just a clueless NSF wanting to learn more about CPF. I have been reading up on CPF the past few days and I'm interested to know the actual math behind the CPF compound interest amount. I read that CPF is compounded both yearly and annually and I would like to know what it actually means. https://blog.seedly.sg/cpf-interest-rate-comput... From what I have currently learnt, you can contribute to CPF funds via your salary. You can also top up your CPF account voluntarily albeit there are certain conditions. https://www.cpf.gov.sg/member/faq/growing-your-... Also, the interest rates for the 3(or 4) different CPF accounts are different based on certain criteria as well. https://www.cpf.gov.sg/member/growing-your-savi... For the sake of this discussion only, let's use this question. John, age 22, plans to top up his CPF monthly. John deposits $100SGD monthly starting from January 2022 into his Special Account, with no initial amount and does NOT receive a monthly salary (to contribute to CPF). In 30 years, How much money will John have in this Special Account and how much of it is earned from interest. Would be nice if a table showing Month 1, Month 2....Year 1, Year 2.... as well as the explanation behind the calculations, is included. Don't need to include all years/months or even a table if an explanation is enough to understand how CPF compound interest works. If someone already has a CPF interest calculator, would be nice if you could share. Thanks for reading this long post. If someone could help me clarify this, I would kindly appreciate it!