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This study aims to analyze the effect of relationship marketing on customer loyalty with customer satisfaction as a mediating variable at Sky Beauty Care Surabaya. Relationship marketing, which encompasses aspects of trust, commitment, communication, and complaint handling, has been identified as an important strategy in building long-term relationships with customers. In this study, a quantitative approach was used with a survey method, where data was collected through questionnaires distributed to customers who have used Sky Beauty Care services. The analysis results show that relationship marketing has a significant effect on customer satisfaction. The trust built between customers and the company, the company's commitment to providing the best service, clear and open communication, and prompt and effective complaint handling all contribute to increased customer satisfaction. This high customer satisfaction, in turn, has a positive effect on customer loyalty. Customers who are satisfied with the service they receive are more likely to use the service again and recommend it to others, ultimately strengthening the customer's relationship with the company. These findings provide an important contribution to Sky Beauty Care in formulating more effective marketing strategies. Better implementation of relationship marketing can increase customer satisfaction and loyalty, which ultimately has a positive impact on business sustainability and growth. Therefore, companies need to continuously strengthen customer relationships by improving service quality, communicating effectively, and responding to customer complaints. Therefore, relationship marketing can be key to successfully retaining customers and increasing their loyalty. Furthermore, this study also shows that customer satisfaction is not only a direct result of relationship marketing but also a key driver in fostering sustainable customer loyalty.

This paper discusses the methodologies for balanced transportation problems and their solutions, focusing on efficient and cost-effective distribution of goods from multiple sources to various destinations. The study highlights the importance of maintaining supply and demand balance and explores systematic approaches such as initial solution methods—North-West Corner, Least Cost, and Vogel Approximation Method—and the optimal solution technique, Stepping Stone. An illustrative case involving a company with multiple factories and markets demonstrates the application of these methods, resulting in minimized transportation costs. Additionally, the process of fertilizer allocation and cost analysis is examined, emphasizing the use of the Stepping Stone method to achieve cost minimization. The findings underscore the effectiveness of combining initial heuristics with iterative optimization to attain optimal transportation solutions, thereby enhancing logistical efficiency and reducing operational expenses.