Net-4-You is an Internet Service Provider that charges its 1 million customers $19.95 per month for its service. The company's variable costs are $0.50 per customer per month.

a)Suppose the company wanted to increase its customers' monthly retention rate and decided to spend an additional $0.20 per month per customer to upgrade its loyalty program benefits. By how much must Net-4-You increase its monthly customer retention rate to avoid reducing customer lifetime value resulting from a lower customer margin?