Question:Current function:

C) Optional Extra Credit (+3 pts). Write a function named calcitrGrd_xc that accepts eight scores and returns the corresponding letter grade, "A" through "F/N". Here's what the function should return: calcFnlPctg_2('125', '135', '10', '90', '90', '90', '90', '90') -> A calcFnlPctg_2('95', '115', '7', '90', '83', '85', '90', '90') -> C calcFnlPctg_2('115', '140', '10', '75', '100', '90', '87', '93') -> B > let calcFnlPctg_2 = function(mt, fnl, xc, p1, p2, 23, 24, p5) { mt = Number(mt); fnl = Number(nl); XC= Number(xc); p1 = Number(p1); p2 = Number(p2); p3 = Number(p3); p4 = Number(p4); p5 = Number(p5); let finalPercentage = 100 * (((mt + fnl + xc) / 300) * 0.7 + ((p1 + p2 + p3 + 24 + p5) / 500) * 0.3); return finalPercentage.toFixed(2); }; calcFnlPctg_2('95', '115', '7', '90', '83', '85', '90', '90'), <. c optional extra credit pts write a function named calcitrgrd_xc that accepts eight scores and returns the corresponding letter grade through here what should return: calcfnlpctg_2> A calcFnlPctg_2('95', '115', '7', '90', '83', '85', '90', '90') -> C calcFnlPctg_2('115', '140', '10', '75', '100', '90', '87', '93') -> B > let calcFnlPctg_2 = function(mt, fnl, xc, p1, p2, 23, 24, p5) { mt = Number(mt); fnl = Number(nl); XC= Number(xc); p1 = Number(p1); p2 = Number(p2); p3 = Number(p3); p4 = Number(p4); p5 = Number(p5); let finalPercentage = 100 * (((mt + fnl + xc) / 300) * 0.7 + ((p1 + p2 + p3 + 24 + p5) / 500) * 0.3); return finalPercentage.toFixed(2); }; calcFnlPctg_2('95', '115', '7', '90', '83', '85', '90', '90'), <.>