18. On selling 30 pencils, a shopkeeper makes a protit equal to the se

1.	18. On selling 30 pencils, a shopkeeper makes a protit equal to the selling price of 10 pencils. Find hisprofit percent?a. 75%b. 20%c. 50%d. 25%
Answer» let sp of 10 pencils =xthen sp of 30 pencils=3xgiven profit =sp of 10 pencils=xcp=sp-profitcp=3x-x=2xprofit%=profit÷cp×100profit%=x÷2x×100=50% let the S.P be = x , so total S.P of 30 pencils = 30x now profit is = 10x so, C P = 30x-10x = 20x profit = (30-20)/20 = 10*100/20= 50% option C

18. On selling 30 pencils, a shopkeeper makes a protit equal to the selling price of 10 pencils. Find hisprofit percent?a. 75%b. 20%c. 50%d. 25%

Answer»

let sp of 10 pencils =xthen sp of 30 pencils=3xgiven profit =sp of 10 pencils=xcp=sp-profitcp=3x-x=2xprofit%=profit÷cp×100profit%=x÷2x×100=50%

let the S.P be = x , so total S.P of 30 pencils = 30x

now profit is = 10x

so, C P = 30x-10x = 20x

profit = (30-20)/20 = 10*100/20= 50%

option C