英语翻译
the turnover and profit from any outlet will vary,depending on a wide range of internal and external variables.each franchisee is expected to take a positive approach to building up sales,although an average rate of return of over 20 percent is generally expected over the liftime of the franchise.
上面这话请帮忙细翻出来,尤其是最后一句.
怎么都觉得别别扭扭的，