Question

Ravish brought hundred articles for rupees 4000 he sold 20 of them at a gain of 5% at what gain percent must he sell the remaining articles so as to gain 20% on the whole

Answer 1

CP of 1 article = 4000/100 =40

CP of 20. = 20×40=800

SP of 20 articles = 800 +800×5/100

===============840

Profit = 840-800=40

We want total profit = 4000× 20/100

===================800

So profit for 80 articles =800-40=760

CP of 80 .......= 80× 40= 3200

Profit % on 80 articles=760/3200×100

==================== 23.75%

So Ravish should sell 80 articles at profit of 23.75%.