(BPT) – According to the Education Market Association, an estimated 99.5 percent of all public school teachers use their own money to equip their classrooms – research suggests it’s frequently at a cost of more than $ 400 per year. Driven by this insight, Staples and Katy Perry have collaborated on a public service announcement to help celebrate and support teachers and classrooms nationwide, just in time for back-to-school season. The PSA also highlights Staples’ recent $ 1 million donation to DonorsChoose.org – a charity that has funded more than 700,000 classroom projects for teachers and has positively affected more than 18 million students across the country – and encourages the public to make their own donations by visiting a local Staples store or www.StaplesForStudents.com.