Kia Motors Corp. and its union reached a tentative agreement on wages on Tuesday after workers agreed to comply with tougher regulations on union staff.This is the first time in 20 years that its management and union concluded collective negotiations without strikes.The union withdrew its opposition to a new law that reduced the number of full-time paid union officials. It agreed to cut the number to 21 from 136 .The number of unpaid full-time union officials will be set through separate negations, the company said.Under the agreement, Kia’s basic monthly salary will be raised by 79,000 won ($66), with bonus payments equivalent to 300 percent of monthly pay and 5 million won cash payment.The company will also provide 120 shares per employ as incentive for pushing up output and sales,The union plans to vote on the agreement on Thursday.Kia’s shares closed at 30,800 won, down 1.44 percent from Monday. cheesuk@heraldcorp.com ) By Choi He-suk