You have just won the lottery. The Lottery Corporation offers you two options: 1. a lump-sum payment of $400,000, or 2. an annuity of $800,000 to be received in equal installments over the next 20 years. At what interest rate, r, Will you be indifferen

You have just won the lottery. The Lottery Corporation offers you two options:  1. a lump-sum payment of $400,000, or  2. an annuity of $800,000 to be received in equal installments over the next 20 years.  At what interest rate, r, Will you be indifferent between the two options?