Given:
Investment: 10,000
term of investment: 6 years
total investment after 6 years: 25,000
Return on investment is calculated by dividing the net profit by the total investment multiplied by 100%.
25,000 - 10,000 = 15,000. This is the net profit.
ROI = (15,000 / 10,000) * 100% = 1.5 * 100% = 150%
The return on investment is 150%.
Total investment does not limit itself to the initial investment, it also includes any additional investment that resulted to having the gross amount earned after 6 years.