With a four to five percent hike in the state's sales tax, the petrol and diesel prices in Karnataka on Saturday were increased by Rs 3 and Rs 3.02, respectively. As per reports, the Karnataka Sales Tax (KST) today has been increased from 25.92 percent to 29.84 percent on petrol and from 14.3 percent to 18.4 percent on diesel, according to the government notification.