Question

ravish bought 100 articles for rs 4000 he sold 20 % of them at a gain of 5% at what gain % he sell the remaining articles so as to gin 20 % on whole?

Answer 1

heya,

Cost price of 100 articles=₹4000
Cost price of 1 article=₹40
Cost price of 20 articles=₹800
Gain on 20 articles=5/100*800=₹40[gain%=5]
Selling price of 20 articles =Cost price of 20 articles+gain on 20 articles=800+40=₹840

Gain on 100 articles=20/100*4000=₹800
[gain=20%]

Selling price of 100 articles=Cost price of 100 articles+ gain on 20 articles=4000+800=₹4800

Cost price of 80 articles=80*40=3200

Selling price of 80 articles=₹3960

Gain on 80 articles=selling price of 80 articles-cost price of 80 articles=3960-3200=₹760

Gain % on 80 articles=760/3200*100=23.75%

#hope it helps......