It’s been awhile since billionaire Bill Gates had to grocery shop among us plebs, so you’ll forgive him if he’s a little disconnected from the price of common items. The Microsoft co-founder appeared on “Ellen” yesterday, where the daytime host had him guessing costs of supermarket sundries like Rice-a-Roni, pizza rolls and forbidden snack-du-jour Tide Pods. SNIP Gates pegged Rice-a-Roni at $5 (it’s $1). He thought a container of Tide Pods cost $4. Please, it’s $19.97. After guessing an exorbitantly high cost for Totino’s Pizza Rolls, the audience took pity on him and pointed him to a more on-the-nose answer...