bad math

yesterday i heard an advertisement for holiday "gift." it was basically a lame excuse for guys who forgot to buy their "significant other" something for Christmas. you could get 15 holiday tulips (still don't know what holiday tulips are) with a vase for $29.99... and for just $10 more you can get 30% more tulips and a candy cane striped vase! do the math...

i come up with 4.5 more tulips.

still not sure how that works.