Please answer and explain

2) The Corn futures contract listing from Monday, December 8th: Corn (CBT)-5,000 bu.; cents per bu. LIFETIME Low Open Int Open High Low Settle Chg High ( 4 7 ) 318.25 16,325 Dec 14 380.50 386.25 376.50 377.50 -4.00 517.00 330.50 671,001 Mar 15 394.00 399.75 389.50 390.25 -4.75 523.25 157,796 May 15 408.25 398.00 398.75 -4.75 339.25 402.25 527.25 408.75 414.50 404.25 405.25 -4.75 534.00 346.75 140, 167 Jly 15 -4.00 511.00 354.25 29,229 Sep 15 414.00 418.25 408.75 410.00 417.25 418.25 -4.50 504.00 364.25 157,271 Dec 15 421.25 426.50 374.25 23,371 Mar 16 430.25 435.00 426.00 427.00 -4.75 510.75 436.50 441.00 512.00 1,774 May 16 433.50 4.50 381.25 432.50 387.50 2,640 Jly 16 443.00 446.75 438.50 438.75 -4.25 515.75 736 Sep 16 436.50 436.50 430.75 430.75 -4.00 498.25 388.00 6,655 Dec 16 427.75 432.00 424.25 424.75 -4.25 490.00 390.00 420.50 421.00 414.75 415.25 -4.25 474.50 402.00 415 Dec 17 We did several examples in class with the Mar 15 contract. Recall that the Settlement price on the November 215t listing we used in class was 385.25 a) Suppose you had taken long position in the Mar 2015 contract on November 21st. How much would you have had to post as margin, on Nov 21, assuming a 20% margin requirement? b) By how much ($$$ and cents) would your margin account have changed between Nov 21 and Dec 8? c) What is the % change in your margin account? (effectively, your Nov 21 to Dec 8 HPR). Round out to xx.yyy% or .xxyyy