Question

by selling a bicycle for ropees 1638 ,Ishita leses 9%.at what price shouls she sell it to make a profit of 15%

Answer 1

cp=100          sp=91(that is 100-9)
cp=?              sp=1638
cross multiply
100*1638/91=cp
cp=100*18=1800


for 15% profit

cp=100               sp=115(100+15)
cp=1800             sp=?
cross multiply
1800*115/100=sp
18*115=sp
sp=rupees2070