A toy that was originally 35$ is now marked down to 28$ what percentage was the toy marked down?

20%.

Here's the math on how I did it

The percentage we are trying to find is how 35 got to 28.

35 - 28 is 7.

Since 10% of 35 would be 3.5, I multiplied 10% by 2 and got 20%.

It was 20% marked down