schweser online mock referring, equation, question, online, return

anothercfainnyc

hI,

i am referring to the pm section, derivatives, question 50 and 51,

How did they get the answer to the collar in question 51,

and question 50, why is the answer? its says what is the value of the swap to Mclaren ,
why do they just calculate one side of the equation, what about the index return??