Suppоse twо cоuntries with domestic cаp-аnd-trаde policies are considering linking their two systems. Country A has a cap of 20 tons of emissions, a domestic marginal cost of abatement of $10, and an uncontrolled emissions level of 60 tons, while Country B has a cap of 40 tons, a domestic marginal cost of abatement of $1q, where q = the tons of emission abatement, and an uncontrolled emissions level of 80 tons. Before linkage, what would be the price in Country A?