How do I calculate this problem I've tried and tried?

A company past experience indicates the 60% of its credit sales are collected in the month of sale, 30% in the next month, and 5% in the second month after the sale, the remainder is never collected, budgeted credit sales were: April 80,000; May 48,000; June 120,000; the cash inflow in the month of June is expected to be.

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