Given:
The price of a cell phone was marked down by $35.
The original price of the cell phone was $212.
To find:
The percentage rate of the discount.
Solution:
We have,
Price marked down by= $35
Original price = $212
Now, the percentage rate of the discount is
![Discount\%=\frac{\text{Price marked down by}}{\text{Original price}}* 100](https://img.qammunity.org/2022/formulas/mathematics/high-school/an3knnr5xrl2b06e4kz0pjmvvedsfchvjf.png)
![Discount\%=(35)/(212)* 100](https://img.qammunity.org/2022/formulas/mathematics/high-school/cm68zprlyl73ahla76cwoc6fgp7d0ibiuo.png)
![Discount\%=(3500)/(212)](https://img.qammunity.org/2022/formulas/mathematics/high-school/hpnq7f5xzggb4wlvngjqxfy52s3rqnfm4q.png)
![Discount\%=16.509434](https://img.qammunity.org/2022/formulas/mathematics/high-school/hbjlhj6x4lp5lgemq5cbfchmyybyd1nvbw.png)
![Discount\%\approx 16.51](https://img.qammunity.org/2022/formulas/mathematics/high-school/66b3uk9txvshmouwgrawsffb3r82zq3dfx.png)
Therefore, the rate of discount in percentage is 16.51%.