| 摘要 |
PROBLEM TO BE SOLVED: To provide an ordinary deposit system with minimum balance interest addition capable of securing a deposit. SOLUTION: This system is provided with a data extracting means 2 for extracting the integrated number of an ordinary deposit account in an ordinary deposit period, this time minimum balance of the ordinary deposit account in a prescribed fixed deposit period, and the previous minimum balance of the ordinary deposit account in the fixed deposit period on the previous ordinary deposit interest calculation date from a data recording means 1 on a prescribed ordinary deposit interest calculation date and a data calculating means 3 for calculating the ordinary deposit interest by multiplying the integrated number by the ordinary deposit interest for the ordinary deposit period, and calculates this time additional interest by multiplying this time minimum balance by an additional interest for the ordinary deposit period calculated by subtracting the ordinary deposit interest for the ordinary deposit period from the fixed deposit interest for the ordinary deposit period, and for calculating the previous additional interest by multiplying the minimum balance calculated by subtracting the previous minimum balance from this time minimum balance by the additional interest for the residual period calculated by subtracting the ordinary deposit period from the fixed deposit period obtained by subtracting the ordinary deposit interest for the residual period from the fixed deposit interest for the residual period. |
