Can someone write this out algebraically please?

To calculate rate of return, set NPV = 0) NPV = 0 = $6400 + $1000 $2000 (1+r)'' (1+r)2 $3000 (1+r) $4000 (1+r)" Solving for r we get, rate of return as 11.9% or 12%. Conclusion: Rate of return as 11.9% or 12%