I)It's expected to grow by 25% by 2020. II)Total sales are expected to shrink as in-store commerce grows. III)Total sales are expected to account for nearly 15% of retail sales by 2020. IV)Sales are expected to grow quickly but shrink as a percentage of total retail sales. [bg_collapse view="button-orange" color="#4a4949" expand_text="Show Answers" collapse_text="Close Answer" ] III)Total sales are expected to account for nearly 15% of retail sales by 2020. [/bg_collapse]