The price of groundnuts increased by x%per week over 2 successive weeks. If at the beginning, 2 Kgs were available for Rs 80 and after 2 weeks they were available for Rs 105.80,what is the value of x?

• use , A = P * (1 + R% )^N
  
  105.8 = 80 * (1 + x%) ^2
  => 1.3225 = (1 + x%) ^2
  => (1.15)^2 = (1 + x% )^2
  => 1.15 = 1 + x%
  => x = 15
• 9 years agoHelpfull: Yes(33) No(1)
• 1st week
  1 kg = 40
  40 x% = 40+ (40*x)/100 = 40 {1+(x/100)}
  
  2nd week
  again 40%
  => 40 { 1+ (x/100)}^2 = 105.8/2 = 52.9
  => 1+(x/100) = 1.15
  => x = 15
• 9 years agoHelpfull: Yes(5) No(1)
• 12.90%
  105.80-80/2=12.90
• 9 years agoHelpfull: Yes(0) No(5)
• 32.25%
  105.80-80=25.80
  25.80/80*100=32.25%
• 9 years agoHelpfull: Yes(0) No(6)
• 15 is answer
• 9 years agoHelpfull: Yes(0) No(3)