I just signed up for a free trial and then $6.95 per month for solutions help for ISBN 978-0-47058723-2. I received an email for an "amount" of $74.95 starting 2/16/13 for "annual homework help subscription." Subtotal, Sales Tax, and Total all zeros. So, I assume you will start charging my credit card starting 2/16/13 but what will you charge me??? Wil Chegg charge by the month or for the entire year? If Chegg charges me for the entire year (I assume $74.95) and I cancel in May, will I get a prorata refund for the unused portion of my subscription? I only need this solutions help for one class for this semest until mid-May 2013