This type of question has always been coming out as a compulsory question in the previous exams (ECN403), please help me out...

Assume a machine that costs #421.2million will last for 5years and each year will earn #100million net income and after 5years the scrap will earn #40million at an interest rate of 6%.

Calculate the Marginal Efficiency of Capital (MEC) and interpret your result.

Please help me solve it, have been trying it but couldn't get it. You can just write it in a paper and snap it.

Mods please help me take it to the limelight where it can be seen, thanks.