Calculate the profit from the following transactions:

1. Short 25 90-day bank bill futures contracts at 96.64 and purchase them back 15 days later at 96.82, when the continuously compounded rate is 1.7794%pa

2. Purchase 22 5-year bond futures contracts at 96.64 when it has 28 days to expiry and sell them at 96.89 2 days later, when the continuously compounded rate is 1.7784%pa

3. Short 7 20-year bond futures contracts at 95.875 and purchase them back later that day at 95.645