The annual interest rate is R, the interest is paid m times within a year, and the interest rate for each interest payment is R/m. According to the principle of compound interest and the equal terminal value under different payment methods, there is "e^(rt)=(1+R/m)^m" ∵ Within one year, t=1; r is the interest rate under continuous interest calculation.

When m=1, interest is paid once a year; when m=2, interest is paid twice a year, that is, interest is paid once in half a year; when m=4, interest is paid four times a year. , that is, interest is paid once every quarter; when m=12, interest is paid 12 times a year, that is, interest is paid once a month; ..., when m→∞, lim(m→∞)(1+R/m) ^m=e^R.

∴To sum up, (3) and (4) are the situations when t=1, m=4, and interest is paid 12 times.