EXERCISE 3-2 Scattergraph Analysis [LO2] Oki Products, Ltd., has observed the following processing costs at various levels of activity over the last 15 months: Required: 1. Prepare a scattergraph using the above data. Plot cost on the vertical axis and activity on the horizontal axis. Fit a line to your plotted points using a ruler. 2. Using the quick-and-dirty method, what is the approximate monthly fixed cost? The approximate variable cost per unit processed? Show your computations