please show steps using financial calculator

7. Beth just read that 40 years ago, milk was about $1.15 per gallon and today it is about $6 per gallon. She thought that seemed very high, especially if she can only earn 7% from her investments. She also thought that she would need about $3 million for retirement in today's dollars. If inflation is the same in the future as it has been over the last 40 years for a gallon of milk, how much will she need to have accumulated when she retires in 30 years