The annual rate issued above shall be calculated according to the ways as follows:
（1）The calculation of the annual rate shall adopt the way of internal rate of return.
m AK m` A`k`
Σ --------- ＝ Σ--------------
K=1 tk K`=l t`k`
This formula is presented with the equation which one side means loan and the other side means repayment by installment and expanses.
K－means serial intervals in which the loan drawdowns.
K`－means serial intervals in which the interest and expanses paid back.
Ak－means the amount the loan drawdown in K interval.
A`k`－means the amount the repayment by installment or payment of expanses in K` interval.
Σ－means the symbol of total amount.
m－means the final or part of serial intervals of the amount of the loan drawdown.
m`－means the final or part of serial intervals of the amount of repayment by installment or expanses payment.
tk－means years or units of year, which is used to calculate the interval between the loan`s first drawdown (k=1) , and m to tk payment (k=2,3,4… m).t1=0.
t`k`－means years or units of year, which is used to calculate the interval between the loan`s first drawdown and borrower`s （ m`- t`k`） (k`=1,2,3…m`) installment.
i－means annual rate.
（2）Annual rate should be round to two decimal.
（3）Repayment by installment should offset the expanses of loan first , interest of loan in second, and the loan principal finally.
（4）The circle of repayment is calculated with standard of 1 year (365 days)、52 weeks or 12 months.
（5）The loan transactions which the principal is not repaid by installments shall calculate annual rate with the condition of repaying matured principal with lump-sum payment when expiration date comes.
（6）If there is any pricing factors which is reserved to change annual rate, leasing business shall also illustrate the probable changing situation.