On January 1, 1988, Antonio invests $9,400 in an investment fund. On January 1, 1989 his balance
is $10,600 and he deposits $2,400. On July 1, 1989 his balance is $14,400 and he withdraws
$1,000. On January 1, 1992 his balance is $16,500. Find the time-weighted yield rate.