How to solve thousand mutiplcation standard algorithm

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

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

If np3 /nc2 = 6, find the value of n