Final answer:
Melanie does not have enough money and she is $225 short.
Step-by-step explanation:
Melanie needs $345 to buy a new bicycle, but she only has $120 saved in her savings jar. To determine if she has enough money, we need to subtract the amount she has saved from the cost of the bicycle. $345 - $120 = $225. Therefore, Melanie does not have enough money and she is $225 short.