Question

A man sold a watch for rs.119 .if the profit % was same as the cp what was the cp

Answer 1

If the CP is x then the the profit percentage will also be x so the equation will be
x*(100+x)/100 = 119
x²+100x-11900= 0
x²+170x-70x-11900=0
x(x+170)-70(x+170)
x= -170 and x= 70
Cost price can not be negative so answer is = 70rs.