FIN 3320- You have just won a government lottery for $12 million

You have just won a government lottery for $12 million. However when you go to collect the prize they explain that you are entitled to receive $100 000 per month for 10 years (this adds to $12 million). Alternatively you may choose to receive a one-time payment now of $10 607 840. What is the implied discount rate the government is using?