It is currently April 1 and Q Corp. needs $5 million loan on May 1. The loan can be repaid on July 31 when an account receivable will be collected. The current LIBOR rate is 3.50%. Q Corp. is concerned with a possible increase in interest rates will rise between now and May 1, in which case Q Corp. will pay a higher rate of interest on the loan. Explain how Q Corp. can lock in the current rate of 3.50% using the Eurodollar futures?