A company's income statement reported Service Revenue of $187,000. The beginning balance of Accounts Receivable was $74,000 and the ending balance was $99,000. During the period, the company received cash from customers totaling $129,000, of which $88,000 was for services performed in the current period and the remaining $41,000 was for services performed in the previous period. The beginning balance of Unearned Revenue was $40,000 and the ending balance was $20,000. What must have been the amount of Cash Received from customers in advance for the period