Last year, you opened an investment account with $6400 . At the end of the year, the amount in the account had increased by 6.5% . How much is this increase in dollars?

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