X Company no longer has the space necessary to produce all of its parts. A company has offered to supply one of X Company's parts for $26.22 per unit. This year, production was 15,000 units; next year, production is expected to be 18,900 units. Per-unit production costs for the part this year were: $11.07 8.21 Materials Direct labor Variable overhead Fixed overhead 6.31 3.24 $28.83 Total $34,992 of X Company's fixed overhead cannot be avoided even if it buys the part. In addition, if X Company buys the part, it will be able to rent some equipment that will no longer be needed, to a company for $3,250. X Company is uncertain about its 18,900 unit production estimate for next year. At what level of production would X Company be indifferent between making and buying the part next year