Sainsbury’s were mocked for ‘Fifty Pence Challenge’ to boost profits. A motivational poster designed for “staff areas” that inadvertently appeared in the window of one of Sainsbury’s east London stores has gone viral on social media. It is unclear how staff are supposed to encourage shoppers to spend an extra 50p on each trip to the supermarket, but Twitter users have some suggestions. One said: “Double swipe a 50p item at the checkout maybe?"