Final answer:
The sale is a 30% discount.
Step-by-step explanation:
To find the percent discount of the sale, we need to compare the original price of the sneakers with the price Jaya actually paid. Jaya multiplied the original price by 0.7 to find the price she would have to pay, before tax. This means that Jaya paid only 70% of the original price.
To find the percent discount, we subtract the price Jaya paid from 100%: 100% - 70% = 30%. Therefore, the sale is a 30% discount.