**Calculating the Result of a Complex Expression**

In this article, we will break down and evaluate the expression `8/5 - 90% + 0.45 × 11/2`

. This expression consists of various mathematical operations, including division, percentage, and multiplication. Let's follow the order of operations (PEMDAS) to arrive at the final result.

**Step 1: Evaluate the Division**

The first operation to evaluate is the division `8/5`

. This yields:

`8 ÷ 5 = 1.6`

**Step 2: Calculate the Percentage**

Next, we need to calculate `90%`

. To do this, we can convert the percentage to a decimal by dividing by 100:

`90 ÷ 100 = 0.9`

**Step 3: Evaluate the Expression inside the Parentheses**

Now, let's evaluate the expression inside the parentheses `0.45 × 11/2`

. We need to follow the order of operations here as well.

`0.45 × 11 = 4.95`

Then, divide the result by 2:

`4.95 ÷ 2 = 2.475`

**Step 4: Combine the Results**

Now that we have evaluated each part of the expression, let's combine them:

`1.6 - 0.9 + 2.475`

First, subtract 0.9 from 1.6:

`1.6 - 0.9 = 0.7`

Then, add 2.475 to 0.7:

`0.7 + 2.475 = 3.175`

**Final Result**

The final result of the expression `8/5 - 90% + 0.45 × 11/2`

is:

`3.175`

Therefore, the final answer is **3.175**.