A person earns 15% on an investment but loses 10% on another investment. If the ratio of the two investments be 3 : 5, what is the gain or loss on the two investments taken together ?

a. 6 1/4 % loss
b. 13 1/8 % gain
c. 13 1/8 % loss
d. None of these

• let the investments be 3x and 5x
  then total investment=8x
  total receipt=115% of 3x+90% of 5x
  =115*3x/100+90*5x/100=7.95x
  loss=C.P-S.P=8x-7.95x=0.05x
  loss%=.05x*100/8x=0.625%
  
• 10 years agoHelpfull: Yes(8) No(0)
• ans:none of the above
  ans:5/8
  let the initial investments be 3x,5x
  total investment=8x
  15%of 3x+10%of 5x=159x/20=7.95%x
  loss=cp-sp=8x-7.95x=0.05x
  loss%=0.05*100/8x=5/8
• 11 years agoHelpfull: Yes(4) No(4)
• let the investments be=45000 and 75000
  profit = 15% of 45000 = 6750
  loss = 10% of 75000 = 7500
  net loss on 120000 =750 = 5/8
  ans=d
• 10 years agoHelpfull: Yes(0) No(0)
• 3x* 23/20 - 5x *9/10 =21x/20 loss..
  (21x/20) *100 /8x=105/8 % Loss
  13 1/8 % Loss.
• 10 years agoHelpfull: Yes(0) No(0)