The Stopdecay Company sells an electric toothbrush for $$25.$ Its sales have averaged $8,000$ units per month over the past year. Recently, its closest

competitor, Decayfighter, reduced the price of its electric toothbrush from $$35$ to $$15.$ As a result, Stopdecay's sales declined by $1,500$ units per

month.

What is the arc cross elasticity of demand between Stopdecay's toothbrush and Decayfighter's toothbrush?

$0\mathrm{.}26$

$3\mathrm{.}85$

$-3\mathrm{.}85$

$-0\mathrm{.}26$

The value of the arc cross elasticity between these products suggests that they are

If Stopdecay knows that the arc price elasticity of demand for its toothbrush is $-1\mathrm{.}4,$ what price would Stopdecay have to charge to sell the same

number of units as it did before the Decayfighter price cut? Assume that Decayfighter holds the price of its toothbrush constant at $$30.$

$$28\mathrm{.}99$

$$15\mathrm{.}00$

$$30\mathrm{.}18$

$$21\mathrm{.}56$

It Stopdecay does not change its price, the average monthly total revenue would be

the same number of units as it did before, the average monthly total revenue would b $lon$

Should Stopdecay change the price of its electric toothbrush?

Yes; as calculated, changing the price increases the total revenue.

No; as calculated, changing the price lowers the total revenue.

It is unclear based on the information given.

$.$ On the other hand, if it changes the price to sell

:$.$