Problem Solving

An investor purchased a share of non-dividend-paying stock for p dollars on Monday. For a certain number of days, the value of the share increased by r percent per day. After this period of constant increase, the value of the share decreased the next day by q dollars and the investor decided to sell the share at the end of that day for v dollars, which was the value of the share at that time. How many working days after the investor bought the share was the share sold, if ?

(A) Two working days later.
(B) Three working days later.
(C) Four working days later.
(D) Five working days later.
(E) Six working days later.