The VP of marketing for a smartphone manufacturer reported the following information at a meeting of the company's executives. $-$ Value of loyal customers $($VLC$)=$$ $749\mathrm{.}25-$ Average selling price $=$$ $999-$ Contribution margin $=30\%-$ Customers purchase our phones once every four years. What is the defection rate for customers of this company's smartphone? $10\%$

$20\%$

$30\%$

$5\%$