Answer:
57.14% of Charlie's jeans are denim.
Step-by-step explanation:
Charlie has 12 + 5 + 4 = 21 pairs of jeans total.
12 of those jeans are denim jeans.
So to get a fraction, we put the denim over the total:
12/21 = .5714 on the calculator.
To change this to a percentage, we move the decimal back two places.
.5714 -> 57.14% of Charlie's jeans are denim.