Cash Price $3200, Down Payment $250, Amount Financed $2950, Number of Payments 18, Amount of Payment $175. Find the Finance Charge and APR

Several paint mixtures are made by mixing blue paint and white paint. paint colors blue paint white paint mixture a 5 cups 12 cups mixture b 6 cups 6 cups mixture c 4 cups 12 cups mixture d 5 cups 6 cups which mixture has the highest ratio of blue paint to white paint