Answer:
The correct answer is 20.0% increase.
Explanation:
In this situation, you would need to find how to find the percentage of change.
Therefore, you will need to first use subtraction, division and then multiplication to justify your answer.
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First, find out how much the original number increased by.
![420-350=70](https://img.qammunity.org/2022/formulas/mathematics/high-school/kvoet64ai5p5nf48m5mmygl5ant7829dnj.png)
Next, divide the 70 with the original number, which is 350.
÷
![350=0.2](https://img.qammunity.org/2022/formulas/mathematics/high-school/nrc750tqe0x8cziogwle2yyptqjr4y8dpv.png)
Finally, to turn your decimal into a whole number, multiply by 100.
×
![100=20](https://img.qammunity.org/2022/formulas/mathematics/high-school/363ldom5i3uvc53bjtwl1m0tgwqxvx9j2g.png)
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Remember to add the percent (%) symbol after receiving your final product.
20%