Solution: Suppose the total number of tickets is a, and the ticket sales in June should be priced at x yuan per ticket, then: May: The number of group tickets sold is ×a=a, and the ticket revenue is 12× a= a; the number of tickets sold for retail tickets is ×a=a, and the ticket income is 16×a=a; June: the number of tickets left for group tickets is ×a=a, and the income available is 16×a=a; retail tickets The remaining votes are ×a=a, and the available income is a×x=ax. According to the question, we get: a+a=a+ax. Solving the equation, we get: x=19.2. Therefore, retail tickets should be priced at 19.2 yuan each to keep the ticket income in the two months flat.