Required: 1. What is the incremental manufacturing cost incurred if the company increases production from 15,500 to 15,501 units? 2. What is the incremental cost incurred if the company increases production and sales from 15,500 to 15,501 units? 3. Assume Kubin Company produced 15,500 units and expects to sell 15,260 of them. If a new customer unexpectedly emerges and expresses interest in buying the 240 extra units that have been produced by the company and would otherwise remain unsold, what is the incremental manufacturing cost per unit incurred to sell these units to the customer? 4. Assume Kubin Company produced 15,500 units and expects to sell 15,260 of them. If a new customer unexpectedly emerges and expresses interest in buying the 240 extra units that have been produced by the company and would otherwise remain unsold, what incremental selling and administrative cost per unit is incurred to sell these units to the customer