【annually】...yearsand11%compoundedsemi-annuallythereafter.a)Calculate...

发布时间:2021-03-27 16:56:10

求解一题英语的金融数学12.Deposits of $450 made at the end of every 6 months for 15 years.The interest rate is 10% pounded semi-annually for the first 7½ years and 11% pounded semi-annually thereafter.a) Calculate the future value of the deposits.[$31,762.03]b) How much interest is earned?[ $18,262.03]公式应该是Sn=R[(1+i)^n-1]/i 英语

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【答案】 15年当中,每半年存450,前面7年半的利率是10%,后面七年半的利率是11%
  题目是不是这个意思?
  因为每半年计算一次利息,所以半年的利息是5%和5.5%,千万别搞错哦
  前7年半的存款:450*(1.05^15-1)/0.05=9710.35,然后再以1.055的半年利率存了15个半年,即最终存款为9710.35*1.055^15=21678.13
  后7年半的存款:450*(1.055^15-1)/0.055=10083.90
  二者最终相加:21678.13+10083.90=31762.03
  所赚利息=31762.03-450*30=18262.03
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