Question

by selling two watches for rs.780 each,ravi gains 20%on one and loss20% on the other find the gain or loss percentage

Answer 1

gain of 20%
sp=rs780
profit=20%
sp=100+p%/100×cp
780=100+20/100×cp
780=120/100×cp
780×100/120=cp
78000/120=cp
19500/30=cp
1950/3=cp
650=cp
loss of 20%
sp=100-l%/100×cp
780=100-20%/100×cp
780=80/100×cp
780×100/80=cp
78000/80=cp
7800/8=cp
975=cp
=》in gain of 20% , cp=rs650
=》in loss of 20%,cp=rs780
total cp=650+780=1430
total sp=780+780=1560
profit=sp-cp
=1560-1430
=rs130
profit%=profit/cp×100
=130/1430×100
=13000/1430
=1300/143
=9.09%
=》profit%=9.09%

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Answer 2

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