Tech Mahindra’s net profit increased 6.8% to Rs 1,378.2 crore in the December quarter, despite supply-side difficulties limiting profit growth. The company also stated that overall income from operations increased by 18.7% to Rs 11,450 crore, but the operating profit margin narrowed to 14.8 percent. According to Milind Kulkarni, chief financial officer, the company’s margins were hit by supply-side problems while it boosted its topline, citing new personnel and wage hikes as examples. Chief executive C P Gurnani added that the company had earlier guided for the margin to be in the range of 15 …