Estimate the total cost and the unit rate per m² in preparing and applying 1 coat primer, 2 coats undercoat and 1 finishing coat to 40m² of metallic surface. Estimating Data: Paint Data: Different types of paint have different coverage rates. The coverage rate for the primer is 10m² per liter, for the undercoat is 8m² per liter, and for the finishing coat is 12m² per liter. The cost of the primer is $20 per liter, the cost of the undercoat is $15 per liter, and the cost of the finishing coat is $25 per liter. Calculate the total cost and the unit rate per m².