教育储蓄的利息如何准确快速地计算?——正比例函数应用实例

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大家知道,教育储蓄是中国农业银行为学生应付将来学习开支需要而开办的一种零存整取储蓄业务,银行规定教育储蓄存期分为一年期、三年期、六年期三种,每月固定存入,最低起存金额为50元,每一账户本金合计最高金额为2万元,它实行利率优惠:一年期、三年期、六年期的年利率分别按开户日一年期、三年期、五年期的整存整取定期储蓄年利率计付利息,并免征利息税。已知一年期整存整取储蓄存款的年利率为2.25%,三年期整存整取储蓄 As we all know, education savings is a kind of zero-saving deposit and saving business that is set up by the Agricultural Bank of China for students to meet the needs of future learning expenditures. The bank has stipulated that the duration of education savings is divided into three types: one-year, three-year, and six-year. Monthly fixed deposit, the minimum deposit amount is 50 yuan, the maximum amount of principal for each account is 20,000 yuan, it implements interest rate concessions: one-year, three-year, six-year annual interest rates are based on account opening date The one-year, three-year, and five-year periods of deposits and withdrawals will be used to calculate the interest rate for periodic deposits and be exempt from interest tax. It is known that the annual interest rate for the entire one-year savings deposit is 2.25%, and the entire deposit is saved in three years.
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