A boy buys 9 apples for rs 9.60 and sells them at 11 for rs 12. Find his gain percent or loss percent.
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cp=9.60/9
sp=12/11
lcm=99
cp=105.60/99
sp=108/99
sp>cp so profit(gain)
profit = sp-cp
=108/99-105.60/99
=2.40/99
progit %=profit/cp*100
=(2.40/99)/(105.60/99)*100
=2.40/99*99/105.60*100
99 &99 cancel
2.40/105.60*100
multiply numerator and denominator by 100 ot remove the decimal
240/10560*100=240/1056*10
=60/264*10
=15/66*10
=5/22*10
=5/11*5
=25/11= 2 3/11%
sp=12/11
lcm=99
cp=105.60/99
sp=108/99
sp>cp so profit(gain)
profit = sp-cp
=108/99-105.60/99
=2.40/99
progit %=profit/cp*100
=(2.40/99)/(105.60/99)*100
=2.40/99*99/105.60*100
99 &99 cancel
2.40/105.60*100
multiply numerator and denominator by 100 ot remove the decimal
240/10560*100=240/1056*10
=60/264*10
=15/66*10
=5/22*10
=5/11*5
=25/11= 2 3/11%
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