Plzz help!! I know the answer with the help of a friend but I need to know how to do it... I need the steps so I can do the rest of the problems

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length