Which of the following is a valid variable declaration and initialization?
a. int while=3;
b. int acase3 = 4.2;
c. string sheepname = “doley”;
d. int 3$var =5.0;

Helen's credit card has an apr of 15.32% and a grace period of 17 days and helen pays her balance in the full every month. if her last billing cycle ended on september 26, 2009, and she made her payment on october 11, 2009, did she owe any interest on her last statement's balance?