The Grammys are good for business. Just ask the members of Mumford & Sons and fun. They’re among the Grammy winning acts who have seen sales of their singles and albums more than double after appearing on the music awards show last Sunday. Sales figures released by Nielsen on Friday show a 182 percent increase in sales of fun.’s hit single “We Are Young” after their wins for Song of the Year and Best New Artist. Album of the Year winners Mumford & Sons, meantime, are enjoying additional revenue from their single “I Will Wait,” which surged 116 percent in sales after the Grammys. Albums by Australian artist Gotye, R&B singer Frank Ocean and veteran rockers The Band, who performed a tribute to their late drummer Levon Helm at Sunday night’s ceremony, also saw sales boosts.