Product $\mathrm{K}$ incurs a total cost of $\$ 10$ per unit sold, as follows.

The marginal revenue (MR) and demand functions for product $\mathrm{K}$ are:
$M R=200-0.4 x$
$p=200-0.2 x$
Where $p-$ price, $x=$ quantity demanded per period.
What is the profit-maximising selling price of product $K$, and what quantity will be sold per period at this price?

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$ per unit 4 Variable production cost Variable selling cost Fixed production cost Fixed selling and administration cost Total cost 423 1 10