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Each teacher receives a $5\%$ raise instead of a $\$1000$ raise.

Every teacher gets a $5\%$ raise.

Instead of $100$percent, the new salary is $105$percent (or $1.05$) of the old salary. As a result, each payment must be multiplied by $1.05$When every value in the data is multiplied by $1.05$, the structure of the distribution remains unchanged since the associations between each data pair remain unchanged. As a result, the new salary distribution shape is identical to the old salary distribution shape.

Instead of $100$ percent, the new salary is $105$ percent (or $1.05$) of the old salary. As a result, each payment must be multiplied by $1.05$ The Median is a measure of the center, as we all know. When every value in the data is multiplied by $1.05$, the distribution's center is multiplied by $1.05$ as well. As a result, the Median is likewise multiplied by $1.05$ We can also argue that the median has risen by $5\%$

As a result, the new salary is $105$percent (or $1.05$) higher than the previous one, which was $100$percent.

As a result, each pay must be multiplied by $1.05$

The interquartile range is a measure of variability, as we all know.

When every value in the data is multiplied by $1.05$, the distribution's variability is multiplied by $1.05$ as well.

As a result, the interquartile range is multiplied by $1.05$

We may also remark that the interquartile range has expanded by $5\%$