Question

Kellogg increases the length of their rectangular Pop-Tarts by 10% and decreases thewidth by 10%. By what percent willthe area of their Pop-Tarts change?ANo changeB1% decreaseс21% increaseD19% decrease

Answer 1

Let the initial length and width Kellogg's rectangular Pop-Tarts be represented as l and b

The area of the initial rectangular Pop-Tarts will be

`\begin{gathered} A_(rec\tan gle)=length\text{ }* width \\ A_{i\text{nitial}}=l* b \end{gathered}`

If the new length is increased 10% of the initial length, then the new length L will be