Ineed with my math who can me plz

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

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

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.