• # question_answer The simple interest on Rs. 600 for 4 years and simple interest on Rs. 600 for 2 years is together equal to Rs. 180. The rate of interest is ? A) 2%                               B) 5%C) 4%                               D) 7%

Suppose rate of interest is r%. Then, $\frac{600\times 4\times r}{100}+\frac{600\times 2\times r}{100}=180$ $24r+12r=180$ $36r=180$ $r=5%$