Ram lends 10000rs. in four parts. If he gets 8% interest on 2000rs. , 7.5% on 4000rs, and 8.5% on 1400 rs. What percent of interest must he get for the remainder if his average annual interest is 8.13% ?

• ans: 9%;
  annual interset=8.13% of Rs.10000 = Rs.813
  for the four parts interest amts. are=>
  1) 0.08*2000 = Rs.160
  2) 0.075*4000 = Rs.300
  3) 0.085*1400 = Rs.119
  4) r*(10000-2000-4000-1400)/100=(813-160-300-119)
  =>r=9%
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• 9.7% is the answer
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