The weekly sales of Honolulu Red Oranges is given by q = 860 − 20p.
where q is the number of oranges sold at the price p dollars per orange. Find E(p)
E(p) =

Calculate the price elasticity of demand when the price is $38 per orange (yes, $38 per orange†). HINT [See Example 1.]

Interpret your answer.
The demand is going by % per 1% increase in price at that price level.

Use the elasticity to calculate the price that gives a maximum weekly revenue.
dollars per orange

Find this maximum revenue.
dollars of revenue