Answers

2015-12-14T22:16:54+05:30
Let buying price=BP 
Selling price Rs60= buying price for 20 articles+ gain 
 told gain is 20%
which means gain=(BP)X (20/100) = 0.2 BP
that shows selling price =60= BP + 0.2BP
 Which means 60=1.2 BP
from which we gets BP= Rs50.  
He got 20 articles for Rs 50  or (20/50)  article per  each Rs.
 So for Rs60 he will get (2/5) X 60 which is  24
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2015-12-14T22:23:58+05:30
20 articles cost price = 60×100÷120=50
rs 50 of cost price of 20 articles
so that rs 1 cost of =20/50
so rs 60 cost of article= 20×60÷50=24 ans ok
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