An amount of RS. 9800 is lent at a certain rate of interest. After 66 months, an additional amount of RS. 5700 is lent at a rate 3.5 times higher than the former. At the end of nine years RS. 11061.75 is earned as interest on both the loans. What was the original rate of interest?

• 7%
  
  If original rate of interest= x%, then
  Total interest= (x% on 9800 for 9 years) + (3.5x% on 5700 for 108-66=42 months or 42/12 years)
  So (9800*9x/100) + (5700*(42/12)*3.5x/100)=11061.75
  882x+698.25x=11061.75
  1580.25x=11061.75
  x=7
• 9 years agoHelpfull: Yes(2) No(0)