Accounting help!

Required information [The following information applies to the questions displayed below.] Kubin Company's relevant range of production is 19,000 to 20,000 units. When it produces and sells 19,500 units, its average costs per unit are as follows: Required: 1. What is the incremental manufacturing cost incurred if the company increases production from 19,500 to 19,501 units? 2. What is the incremental cost incurred if the company increases production and sales from 19,500 to 19,501 units? 3. Assume that Kubin Company produced 19,500 units and expects to sell 19,210 of them. If a new customer unexpectedly emerges and expresses interest in buying the 290 extra units that have been produced by the company and that would otherwise remain unsold, what is the incremental manufacturing cost per unit incurred to sell these units to the customer? 4. Assume that Kubin Company produced 19,500 units and expects to sell 19,210 of them. If a new customer unexpectedly emerges and expresses interest in buying the 290 extra units that have been produced by the company and that would otherwise remain unsold, what incremental selling and administrative cost per unit is incurred to sell these units to the customer