Ingham Corporation Recently Changed the Selling Price of One of Its

Ingham Corporation recently changed the selling price of one of its products.Data concerning sales for comparable periods before and after the price change are presented below. The product's variable cost is $16.40 per unit.
According to the formula in the text,the product's profit-maximizing price is closest to:
$\begin{array}{l}\text { Selling Price}& \text { Unit Sales }\\\$ 74.00 & 4,300 \\\$ 68.00 & 5,090\end{array}$

A) $35.82
B) $32.89
C) $35.23
D) $20.74