Answer / sunil

profit is sp(selling price) -cp(cost price)
12(sp-cp)=4sp
8sp=12cp
sp/cp=12/8
profit percentage is( (sp-cp)/cp )100
or (sp/cp -1)100
(12/8 -1)100
(4/8)100
Ans 50%

Answer / pardeep

let the selling price of one ball pen is one rupee.
and the selling price of four ball pen will be 4 rupees.
the formulla is
costprice + profit/loss = selling price
let costprice=x
x + sellingpriceof 4 ballpen = selling priceof 12
x = selling priceof 12-sellingpriceof 4 ballpen
x=selling priceof 8
ans= 4 is 50% percent of 8

Answer / dinesh

ans is 33% because shopkeeper has 12 pens and earned the
profit equal to the profit of 4 pens price ie (4/12)100
=33.33 ~33

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