Question

a trader sold two cameras for 990 each on one he gain 10% and on the other loses 10% calculate his gain or loss percentage in the whole transaction

Answer 1

case I

sp=990

profit%=10

so

cp=sp*100/100+p%

=990*100/100+10

99000/110

=900

case II

so=990

loss%=10

cp=sp*100/100-L%

=99000/90

=1100

at last

total sp= 990*2=1980

total cp=900+1100=2000

so. loss%=(cp-sp/cp)*100

=(2000-1980/2000)*100

= 0.01*100

=1

therefore loss% in whole transaction is 1%

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Answer 2

each camera cost 990 rupees
990*2 = 1980
** one he sold with 10% profit.
990÷10 = 99 (990+99=$1089)
*** second he sold with 10% loss
990-99 = $891
whole transaction =1089+ 891 = 1980
so two transactions are same...
T1 = 1980
T2 = 1980