Cost of project is 3000000 Revenue in the first year 100000 ,second year 200000 and will be 250000 annualy after this What is payback period

Y0 is the outflow of3 million

Y2 return is100,000

Y3 return is200,000

leaves2,7 million 

2.7 / .25 =10.8 years

so total payback period is12.8 years