Тестовое задание

To achieve the goal of carbon reduction, the government of a certain country has required two domestic companies, A and B, to reduce 100 units of carbon emissions in total, assigning each of them the reduction by 50 units. For A, the marginal cost of reducing emissions is 3qa dollars, while for B, it is 2qb dollars. The companies can trade their reduction amounts between each other at the competitive price. How much will one of the companies pay the other in equilibrium?