.253 move the decimal 2 places to the right then you get 25.3%
Kelli ran 4 more miles than the week before, so to find what percent that is of 28, divide.
4 / 28 = 0.142857143, or ~14.29%
Kelli ran 14.2857143% or about 14.29% more miles than last week.
Ali has 13 CD's
Here's how I got my answer:
Step 1: Simplify
to 50. Which leaves us with 
Step 2: Simplify
to 5. Which leaves us with
.
Step 3: Simplify
, to get your answer, 13.