Your friend Niels Bohr is in Addis Ababa. At the end of his first year of employment, his salary was raised by 11 % and after his second year the salary was reduced by the same percent. After these two revisions, your friend's salary has changed by (in per cent):
a) 0.11
b) 5.5
c) 0
d) 1.21

• intial salary be x
  after one year 11% raise of his present salary so x+0.11x=1.11x
  after 2nd year 11% decrease of present salary so 1.11x-(1.11x * 0.11)= 0.9879x
  so after two versions change of his salary wil be x-0.9879x = 0.0121
  in percentage 0.0121*100 = 1.21
• 11 years agoHelpfull: Yes(13) No(0)
• Formula : square of (x/10).
  
  square of (11/10)
  = square of (1.1)
  = 1.21 % reduction.
• 11 years agoHelpfull: Yes(4) No(0)
• (d) 1.21. consider his initial salary to be 100 rs, then after increase in his salary, it will become rs 111, and after 11% decrease, it will become 98.79 rs. so % decrease= 100-98.79/100*100 = 1.21
• 11 years agoHelpfull: Yes(2) No(0)
• the answer is 1.21%.
  take his intitaila salary be x.
  After first year his salary will be (x+(11x/100))=111x/100
  After 2nd year his salary will be (111x/100)-((111x/100)*(11/100))=9879x/10000
  in total his salary is changed by, x-9879x/10000 = 121x/10000
  thus answer is 1.21%
• 11 years agoHelpfull: Yes(1) No(0)
• assume the salary be 100
  first it is raised by 11% so new salary was 111
  and reduced by 11% now the salary was 98.79
  therefore decreased overall by 1.21%
• 11 years agoHelpfull: Yes(1) No(0)
• 1.21
  Because formula for this is given by=+or-x+or-y+or-(x*y/100)
  +11-11-(11*11)/100=1.21
• 11 years agoHelpfull: Yes(1) No(0)
• IF ANYTHING IS INCREASED AND DECRESED BY SAME PERCENTGE, THE FORMULA IS (X/10)^2
  (11/10)^2=1.21
• 11 years agoHelpfull: Yes(1) No(0)