Apply Polya’s Strategy to solve the following problem An investor bought 20 shares of stock for a total cost of $1200 and then sold all the shares for $1400. A few months later, the investor bought 35...

Apply Polya’s Strategy to solve the following problem

1. An investor bought 20 shares of stock for a total cost of $1200 and then sold all the shares for $1400. A few months later, the investor bought 35 shares of the same stock for a total cost of $1800 and then sold all the shares for $1900. How much money did the investor earn on these investments?