30% increases in price of eggs, 3 eggs are less avail for 7.80 so present rate of eggs per dozen?

• 9.36
  
  Let x be the initial price of egg and n number of eggs
  
  x*n = 7.8--(1)
  
  Price increases by 30%
  new price = x + 30/100*x
  =13/10*x
  
  13/10*x (n-3)= 7.8
  x * (n-3) = 6
  x*n - 3x = 6
  7.8 - 3x = 6
  x =0.6
  new price = 130/100*0.6=0.78
  Rate per dozen = 0.78*12 = Rs9.36 per dozen
  
• 10 years agoHelpfull: Yes(2) No(0)
• Let the original price per egg be Rs x
  Then increased price ll be, 130x/100
  
  =>7.80/x − 7.80/130x/100 = 3
  =>7.80/x − 780/130x = 3
  =>390x=234
  =>x=0.6
  Actual price was Rs 0.6
  Present price per dozen ll be Rs.(12∗130/100∗0.6)= Rs.9.36
  
  Ans : 9.36
• 10 years agoHelpfull: Yes(2) No(0)
• let rate of eggs per dozen be x rs
  rate after 30% increase = x*130/100 = 1.3x rs per dozen
  then, (7.8/x)*12 - (7.8/1.3x)*12 = 3
  => 7.8*12/x(1 - 1/1.3)= 3
  => x = 7.8*12*.3/ 1.3*3 = 7.2
  
  x = 7.2 per dozen
• 10 years agoHelpfull: Yes(0) No(6)