Your profit from
1st year clients: $5000*5 years*100 clients*10% = $250,000
2nd year clients: $5000*4 years*100 clients*10% = $200,000
3rd year clients: $5000*3 years*100 clients*10% = $150,000
4th year clients: $5000*2 years*100 clients*10% = $100,000
5th year clients: $5000*1 years*100 clients*10% = $50,000
Total, 5 years: $750,000