Question

A person bought two watches for rs 480.he sold one at a loss of 15% and the other at gain of 19% and

Answer 1

119/100)CP1=CP2(85/100) (since both sp are equal)
cp1+cp2=480
cp1=cp1
cp2=cp1(119/85)
by solving we get
cp1=200;
cp2=280;
here we use the formulae
cp=(100/(100+g)100)sp
for loss replace + with - and g with l