We consider an investor trading a single stock over a period of time. At the beginning of any day, the investor checks how the price of the stock has changed from the previous day and then decides how many shares $($if any$)$ to buy or sell at the new price. The random factor in this problem is the stock price. We assume that the transaction will occur only at the beginning of the day so it is sufficient to consider price change from one day to the next. The trading strategy is pure "buy low and sell high" as follows:

Price increases $3$ days in a row $-->$ sell $25\%$ of share

Price increases $2$ days in a row $-->$ sell $10\%$ of share

Price decreases $3$ days in a row $-->$ buy $25\%$ more

Price decreases $2$ days in a row $-->$ buy $10\%$ more

Other wise $-->$ do nothing

Build an Excel$-$based simulation model for the trading strategy. Simulate $200$ trading days