At the beginning of 2009,Miss Wong deposited a sum of money in a bank at an interest rate of 8% p.a.compounded yearly.If the interest she will receive at the beginning of 2011 is 12480,find(a)the principal(b)the amount she can receive at th

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At the beginning of 2009,Miss Wong deposited a sum of money in a bank at an interest rate of 8% p.a.compounded yearly.If the interest she will receive at the beginning of 2011 is 12480,find(a)the principal
(b)the amount she can receive at the beginning of 2014.

2009年初,王女士存入银行一笔钱,年利率 8%,以复合利率计算,2011年初王女士收到利息12480,则(1)金是?(2)2014年初她可以得到多少?
设本金为x
x*(1+8%)的平方=12480+x
复利计算方式:本金P*(1+利率)的(年数)次方=本金+利息
(1)x本金=75000
(2)2014年=x*(1+1.08)的五次方=110199.6