Question

a seller sold to trouser of rupees 900 each one of he gains 10% and on another he lost 10% find his total loss or gain

Answer 1

Sp of one trouser RS. 900
Sp of two trouser RS. 1800
Gain at the first trouser is 10%
Loss at second trouser 10%

Cp of first trouser is Sp*100/100+p%
990*100/100+10
99000/110
RS. 900

Cp of second trouser is Sp*(100-l%)/100
99*(100-10)/10
99*90/10
99*9
RS.891

Total cp = Cp of 1st trouser + Cp of 2nd trouser
= 900 + 891
= RS.1791
Total Sp = RS. 1800
so therefore profit

Sp - cp
1800 - 1791
RS. 9
Profit % = profit*100/cp
= 9*100/1791
0.50%

Hope helps