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student1187

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  • tutor_fran
    2018-11-26 15:03:36
    18bi)
    there are 2 solutions for u:
    solution1: t=4.5*2=9; A=4000+4000*12%*9, A=8320, percentage change= (8320-6160)/6160=+35.1%
    solution2: for twice as long as the in (a), we can find the total interest in 9 years: 2160*2=4320, A=4000+4320=8320, (8320-6160)/6160=+35.1%

    18bii) 12%/2=6%, A=4000+4000*6%*4.5, A=5080, (5080-6160)/6160=-17.5%
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