Could you please show me how to calculate on financial calculator

1)You have just won the California Lottery jackpot of $10,000,000, The lottery commission has offered you a full payout of $10 Million dollars paid over 20 equal annual installments with the first payment made immediately, or one-time cash payment today of $5,000,000. you may opt for a a) If your opportunity cost is 6%, which choice should you select? b) Given these assumptions, what is the intrinsic value (NPV) of the 20 annual installments