SSC MTS 26 Jul 2022 Shift 1 Paper

Karun borrowed Rs. 12,000 from Varun and Rs. 15,000 from Tarun, each for two years at the same rate of simple interest per annum. If he paid an interest of Rs. 1,680 to Varun at the end of 2 years, then what is the interest that Karun paid to Tarun at the end of the 2-year period?