Gary's Shoes and Accessories is attempting to quantify the value of a loyal customer. Al Bundy, Gary's data analyst, has carefully analyzed ten years of data and determined that its customers tend to purchase a new pair of shoes every two years and its customer defection rate is $25\%.$ Gary's fixed costs are $20\%,$ and it makes a before$-$tax profit of $10\%.$ The revenue for the store's Peggy line of shoes, which accounts for virtually all of the sales, is $$250.$ An aggressive marketing campaign is planned that $Al$ estimates will increase the store's share of customers by $8,000.$ What is the market value increase?

a$.$ $$650,000$

b$.$ $$450,000$

C$.$ $$1,200,000$

d$.$ $$550,000$