The company had sold 64,341 units in the same month last year, Tata Motors said in a statement.
Total passenger vehicle sales in the domestic market stood at 11,804 units in June, down 31.54% from 17,244 units in the same month last year.
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In the commercial vehicles segment, the company's sales dropped by 10.03% to 36,908 units in the domestic market during the month under review compared to 41,026 units in the corresponding period last year.
The company's exports dropped by 34.17% to 3,996 units last month from 6,071 units in the same month last year, it added.