self Maths Puzzle

An investor bought shares at certain value. After a fall in price of the share by X%, the investor has to wait 1.25X times the increase in the price of the shares to get the original invested amount.
What is the value of X ?

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self Other Question

SON:HOW MUCH TIME DOES IT TAKE TO GO TO OFFICE FROM HOME?
FATHER:WHEN I START THE MINUTES AND HOUR HAND AT SAME PLACE AND WHEN I GO TO OFFICE THEY ARE AT OPPOSITE TO EACH OTHER?
SON:DOES THEY ARE EQUAL WHEN YOU START
AT HOME AND GO TO OFFICE?
GUESS THE TIME TAKEN
FOR JOURNEY
1/0,3/1,7/3,13/8,19/21,?