Question

The value of an antique mirror increased by 40% since juliet bought it. Its value is now $350. What amount did juliet originally pay for the mirror.

Answer 1

The problem states that the current value is $350 and that is the original price plus 40%, that is $350 is the 140%, the question is how much is the 100%, or the original price, lets use a rule of three, simple, direct proportion:
140% --------> $350
100% --------> x
x = (100)(350)/140
x = 250
that is the original price, $250

Answer 2

350(0.4) 140 and that how i get the answer.