The average purchase price is $$75$ per visit, the frequency of repurchase is six times per year, the contribution margin is $10$ percent, and the average customer defection rate is $25$ percent. how the value of a loyal customer will change if the average customer defection rate varies between $15$ and $40$ percent $($in increments of $5$ percent$)$ and the frequency of repurchase varies between $3$ and $9$ times per year $($in increments of one year$).$