60% annual income on investment sounds very low for scryptmining profits and low for btc mining profits for the next 12 months based on today's difficulty and reasonable assumptions on the future development of it unless you by that mean 160% ROI year 1, 60% return year 2,3,4....

But either way how did you come up with that number and how can you even estimate/guarantee any such returns that far into the future ??