Melba Company is evaluating investing in a 10-year 4% coupon bond with a current market price of $851.23 which indicates the market expects a 6% yield to maturity for this bond.

Melba estimates it will be able to reinvest the coupon interest payments at an annual interest rate of 5% and at the end of the its planned investment horizon the bond will have six years until maturity and will be selling to achieve a 7% yield to maturity. This means the value of the bond will be $855.05 at the end of Marks investment horizon.

If the combined dollar amount of coupon interest plus interest on interest is $172.22, how much is the interest on interest?