mr.paul invested rs.50,000 partly at 10% and partly at 15% s.i. his total income after a year was rs.7000. how much did he invest at the rate of 10%?

• let the sum lent at 10% be rs x so at 15% it will be (50,000-x)
  then using s.i = (p*r*t)/100
  (x*10*1) (50,000-x)*15*1
  -------- + --------------- = 7000
  100 100
  
  calculate x, ans is then x= 10,000 at 10%
  and 40,000 at 15%
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