A man invested $2500 into two parts such that if one part be put out at 5% S.I. and other at 6%, the yearly income may be $140. How much did he invest at 5%?
A. $1250
B. $1500
C. $1000
D. $750
E. $900

• $1000
  let part invested at 5% is x
  then another part at 6% is (2500-x)
  
  using P*R*T/100
  and given that yearly income 140,
  
  (2500-x)*6*1/100 + x*5*1/100 = 140
  15000- 6x + 5x = 14000
  x = 1000
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