Please answer question 3 only

Calculate the profit from the following transactions: 1. Short 25 90-day bank bill futures contracts at 97.64 and purchase them back 15 days later at 97.89, when the continuously compounded rate is 1.77894%pa 2. Purchase 22 5-year bond futures contracts at 97.64 when it has 28 days to expiry and sell them at 97.89 2 days later, when the continuously compounded rate is 1.77894%pa 3. Short 7 20-year bond futures contracts at 96.875 and purchase them back later that day at 96.825