What has a one dimensional and have infinite length

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

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !

How do i take any fraction and make it into a decimal or percentage?