If 90 is increased by `10%` , then find the increased amount.

Answer

To solve the problem of finding the increased amount when 90 is increased by 10%, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Original Amount and Percentage Increase**:
- The original amount is 90.
- The percentage increase is 10%.

2. **Convert the Percentage to Decimal**:
- To find 10% of 90, we first convert the percentage to a decimal.
- 10% can be written as \( \frac{10}{100} \) or 0.10.

3. **Calculate the Increased Amount**:
- Now, we calculate 10% of 90:
\[ \text{Increased Amount} = 10\% \text{ of } 90 = 0.10 \times 90 \]
- Performing the multiplication:
\[ 0.10 \times 90 = 9 \]

4. **Find the New Amount After Increase**:
- To find the new amount after the increase, we add the increased amount to the original amount:
\[ \text{New Amount} = \text{Original Amount} + \text{Increased Amount} = 90 + 9 \]
- Performing the addition:
\[ 90 + 9 = 99 \]

5. **Final Answer**:
- Therefore, if 90 is increased by 10%, the new amount is 99.

### Summary:
If 90 is increased by 10%, the increased amount is 9, and the final amount becomes 99.