Determine the interest rate () that makes the pairs of cash flows shown economically equivalent. $3,500 $3,500 $3,500 $3,500 $3,500 $3,500 0 1 2 3 4 6 Years i=? B $4,000 $3,000 $2,250 IIII Q $1,688 $1,266 $950 0 1 2 3 4 5 6 Years The interest rate (1) that makes the pairs of cash flows shown economically equivalent is %. (Round to two decimal places.)