Ravi borrows a sum of rs. 1200 at the begining of a year.After 4 months,an amount of rs. 1800 more is borrowes at a rate of interest double the previous one .At the end of the year,the sum of interest on both the loans is rs 216.what is the first ate of interest per annum?

• 6%
  
  If rate of interest=r.
  Here Rs. 1200 is invested for 1 year and Rs. 1800 is invested for 8 months or 2/3 year, then
  Simple interest= (1200*r/100)+ [1800*(2/3)*(2r/100)]=216
  On solving, r=6
• 9 years agoHelpfull: Yes(0) No(0)