This is a frequent error in news reports:
In 2015, Frappuccinos were 14 percent of Starbucks revenue: Year-to-date, however, the drink’s sales are down 3 percent — and now account for only 11 percent of the company’s revenue.
3 percent of 14 percent is 0.4 percent, not 3 percent.
What should have been written is “sales are down 3 percentile points“. As dictionary.com says
Never leave a journalist alone in a room with a number.