Treasury spot rates (expressed as semiannually pay yields to maturity) are as follows: 

6 months 4.0%, 

1 year 4.5%, 

1.5 year 5.0% 

2 year: 5.5% and 

3.5 year: 6.0%. 

A 2.5 year, 2.5% Treasury bond is trading at $890. What is the arbitrage trade and how much would profit would you earn from doing the trade?