Bill buys a stock that decreases by $20\%$ on the first day, and then  on the second day the stock increases by $30\%$ of its value at the end of the first day. What was the overall percent increase in Bill's stock over the two days?
Question:
Bill buys a stock that decreases by $20\%$ on the first day, and then  on the second day the stock increases by $30\%$ of its value at the end of the first day. What was the overall percent increase in Bill's stock over the two days?
Answer:
Let's think step by step.

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4
Bill buys a stock that decreases by $20\%$ on the first day, and then  on the second day the stock increases by $30\%$ of its value at the end of the first day. What was the overall percent increase in Bill's stock over the two days?
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