If the first payment is at year 2, the first payment is $10 and PV0 for this perpetuity is $150, what is the interest rate? If the first payment is at year 1, r = 10% and PV0 for this perpetuity is $100, what is the PV0 for the payment made at year 20? If the first payment is at year 2, r = 10% and PV0 for this perpetuity is $80, what is the PV0 for the payment made at year 60