The company had sold 26,495 units in December 2016, SMIPL said in a statement.
Domestic sales stood at 32,786 units last month as against 21,362 units in December 2016, a growth of 53.47 per cent.
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Exports were at 7,000 units as against 5,133 units in December 2016.
During 2017, the company sold a total of 5,41,389 units, up 37.46 per cent over 3,93,828 units clocked in 2016.
"With over 4 lakh sales completed in this financial year already, we are well-poised to achieve our annual target of 5 lakh sales annually," SMIPL Executive Vice-President, Sales and Marketing Sajeev Rajasekharan said.