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英语翻译an employee was promiseed ayearly rise of his salary of

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英语翻译
an employee was promiseed ayearly rise of his salary of 4% in 2008 and 2009.but in2009 this rise was cut by 30%.find the percentage P of the total rise for these two years.
有一个工人,被许诺在2008年和2009年,工资每年递增4%.但是在2009年工资涨幅被减少了30%.求他的工资在两年里总共增长了百分之几(P).
应该是这样做吧:
P=4%+4%(1+4%)(1-30%)