2. Suppose the price of printing paper for digital cameras has recently risen by 10 percent due to an increase in the cost of materials used in the finish for the paper. As a result, less photo printing paper is being sold in the office supply store where you work. You do some checking and find that digital camera sales are down by 4 percent. What is the cross-price elasticity of photo printing paper and digital cameras? Are these two goods complements or substitutes