If n+10=40,then what is the value of the expression n-25

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

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

Pls never taught i’m really confused and i rlly need