Can sum1 tell me what the volume is pls?

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

3x = 729 solve for x plz . it's urgent. will mark

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top