Mittens are marked down 25%. the sale price is $3.15 a pair. what was the original price of a pair of mittens?

Let the original price be x.

It was marked down by 25%, means it was reduced by 25%.

If it was reduced by 25%, it means its value is 100% - 25% = 75%

The price is now $3.15

75% of x = 3.15

(75/100)x = 3.15

0.75x = 3.15

x = 3.15/0.75

x = 4.2

The original price of the pair of mittens = $4.20.

I hope this helps.