Can you please explain how you worked out the problems using a finance calculator or reg calculator so I understand the concept. thanks!

What is the future value of $7,500 invested today and held for 12 years at 12.35% compounded semi-annually? P/Yrr= N= 1= PV= PMT= FV= Moonlight Industries just signed a sales contract with a new customer. JK will receive annual payments in the amount of $35,205,$49,526,$65,256, and $72,580 at the end of Years 1 to 4 , respectively. What is this contract worth at the end of Year 4 if the firm earns 4.53% on its savings? Answer with 2 decimal points. Show your work