example Suppose the owner of a small shop is considering investing a new machine that costs S1000 and it has a useful life of a year. The expected net revenue is $1100, the net profit is $100 The expected rate of net profit顸期净利 润率is10 per cent 01-08-0801-08-08 6 example • Suppose the owner of a small shop is considering investing a new machine that costs $1000 and it has a useful life of a year. • The expected net revenue is $1100, the net profit is $100. • The expected rate of net profit(预期净利 润率) is 10 per cent. =(1100-1000)/1000