This is the 436th most frequent Finnish word.
tarpeeksi
"Tarpeeksi" means "enough" or "sufficiently" in English.
In this sentence, 'tarpeeksi' is used to indicate sufficiency concerning an amount of 'money' to make a purchase.
Minulla on tarpeeksi rahaa ostaa tämä kirja.
I have enough money to buy this book.
In this example, 'tarpeeksi' again expresses sufficiency, focusing on the amount of 'rest' taken post travel.
Oletko levännyt tarpeeksi matkasi jälkeen?
Have you rested enough after your trip?
Here, 'tarpeeksi' is used to indicate a sufficient quantity of 'rahaa' (money).