The selling price of 10 books
is equal to the cost price of 12 books. Find profit percent.
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let the sp of 10 books be 100
then,cp of 12 books is 100
sp of 1 book=100/10=10
cp of 1 book=100/12=25/3
profit =10-25/3
=(30-25)/3 =5/3
profit%=(5/3)/(25/3)×100
=20%
then,cp of 12 books is 100
sp of 1 book=100/10=10
cp of 1 book=100/12=25/3
profit =10-25/3
=(30-25)/3 =5/3
profit%=(5/3)/(25/3)×100
=20%
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