More statistics abuse

I'm not sure what's going on here . . . this is the story, from that venerable publication, USA Today:

Sales of Girl Scout cookies are down 20% this year. "If a customer was purchasing 6 to 8 boxes, now they're purchasing 3 or 4," said Marianne Love, the groups director of business services.

What is 20% of 6? What's 20% of 8? In case you haven't figured it out, the example she gives is a 50% decrease, not a 20% decrease. She's either deliberately inflating the reduction in sales or she needs to go back and repeat 4th grade math.