The Brainliest Answer!
No. of eggs the shopkeeper bought- 300
Rate of eggs- 80p/egg
total expenditure on it(CP)- 300*80 p =24000 p
Then 24000 p into rupees=  \frac{24000p}{100p} = Rs.240.
Now, the loss of eggs on transaction= 300-30= 270 eggs.
Now, the eggs' SP= 270*1= 270 Rs.
Therefore, as SP>CP, then, 
there is a gain.
So, the gain%=  \frac{GainX100}{C.P.}
So, gain= Rs.270-Rs.240= Rs.30.
Now, gain%=  \frac{30X100}{240}= 12.5%= Ans.
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