Year $1$:Discounted Cash Flow $=$ $$200,000*(1/(1+10\%))=200,000*(0,9091)=$ $$181,818$

Year $2$:Discounted Cash Flow $=$ $$250,000*(1/(1+10\%)^2)=250,000*(0,8264)=$ $$206,600$

Year $3$:Discounted Cash Flow $=$ $$300,000*(1/(1+10\%)^3)=300,000*(0,7513)=$ $$225,390$

Year $4$:Discounted Cash Flow $=$ $$350,000*(1/(1+10\%)^4)=350,000*(0,6830)=$ $$239,050$

Year $5$:Discounted Cash Flow $=$ $$400,000*(1/(1+10\%)5)=400,000*(0,6209)=$ $$248,360$

And npv $=$ $$101,218$

Cakculate IRR and payback period