You earn $10\%(R1)$ in year $1.-5\%(R2)$ in year $2$ and $25\%(R3)$ in year$3$

a$)$ What is your arithmetic average return?

b$)$ What is your geometric average return?

c$)$ What is your IRR if you invested $$100$ at the beginning year $1,$$$200$ at the beginning of year $2$ and $$300$ at the beginning of year $3?$

Please answer a$,$ b$,$ c