It’s back-to-school shopping time and that means plenty of spending, but did you know it can also mean a bit of earning, too? As PC Mike Wendland reports, using the right app can take some of the pain out of opening your pocketbook when it comes to back-to-school shopping. The Ibotta app helps users earn cash back rewards on purchases made in-store or in-app. No need to cut coupons or manage discounts and promo codes. Simply check Ibotta before you make a purchase in your favorite apps, and get rewarded with money back rebates. The app works with a wide range of brands and retailers, too, and once signed up,…