stitution Ratio Calculation: Divide change in amount being replaced Input by the change in the amount being added. Ration Calculation: Divide the price of the input being added by the price of the input being replaced. To find the substitution ratio - Input Price Ratio) Get as close as you can without going over. "best" or least-cost combination of input use the Input must equal the input price ratio. (Input Substitution Ratio Input Input Dairy Grain Hay substitution price Total cost Feed (lbs) (lbs) ratio 700 1350 800 1130 900 935 1000770 1100625 1200525 1300 445 ratio of ration 5. Grain is worth 9 cents/lb and hay 6 cents per pound. Grain is being ad and hay being replaced. Calculate the input substitution ratio, the input price ratio and the total cost of each ration fill in the blanks above. The input price ratio will be the same for each blank. 6. What is the least cost ration in the table above. Get close without going over the least cost. Lbs of Grain: Lbs. of Hay