Let be "t" the total amount of money you will receive.
According to the information given in the exercise, you can sell each share of Michaels Flowers at $7.28. Since you sell 175 of them, you get:

You also know that you can sell each share of Nanotech One at $10.80. Therefore, the amount of money you'll receive for these shares of Nanotech One, can be calculated by multiplying the price of one share by the 445 shares you will sell:

Then, you can set up that:

The answer is: $6,080