Answer
$243$ ways.
Work Step by Step
The Fundamental Counting Principle:
The number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur.
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1. The change in the 1st stock has 3 ways of occurring.
2. The change in the 2nd stock has 3 ways of occurring.
3. The change in the 3rd stock has 3 ways of occurring.
4. The change in the 4th stock has 3 ways of occurring.
5. The change in the 5th stock has 3 ways of occurring.
Total ways = $3\times 3\times 3\times 3\times 3=3^{5}= 243$ ways.
