I have question of my homework chapter 1 managerial accounting

Kubin Company's relevant range of production is 14,000 to 20,500 units. When it produces and sells 17,250 units, its average costs per unit are as follows:

Average Cost per Unit

Direct materials$7.50

Direct labor$4.50

ariable manufacturing overhead$2.00

Fixed manufacturing overhead$5.50

Fixed selling expense$4.00

Fixed administrative expense$3.00

Sales commissions$1.50

Variable administrative expense$1.00

Required:

1. For financial accounting purposes, what is the total amount of product costs incurred to make 17,250 units?

2. For financial accounting purposes, what is the total amount of period costs incurred to sell 17,250 units?

3. For financial accounting purposes, what is the total amount of product costs incurred to make 20,500 units?

4. For financial accounting purposes, what is the total amount of period costs incurred to sell 14,000 units?

Can you help me with question 3,4 I don't know how to calculate if it not 17,255 units