Today for a 3,30€ bus fare I handed over 4,40€. Lightening my pocket of coins is simple enough, but for physical transaction efficiency it assumes that both cus

Today for a 3,30€ bus fare I handed over 4,40€. Lightening my pocket of coins is simple enough, but for physical transaction efficiency it assumes that both customer and recipient can do simple math in their heads. Your local educational system may or may not provide appropriate guarantees of this.