Learn Spanish (Latin America): La computadora cuesta novecientos dólares o mil pesos. - The computer costs nine hundred dollars or one thousand pesos.

In Spanish, the number nine is nueve, but the prefix for 900 changes slightly to nove-. So instead of nuevecientos, it becomes novecientos. It is one of the few irregular hundred numbers you just have to memorize, along with 500 (quinientos) and 700 (setecientos).

Why does it say mil pesos instead of un mil pesos for one thousand?

In Spanish, you never use un before mil when saying exactly one thousand. It is always just mil. You only put numbers in front of it when you have two thousand or more (like dos mil, tres mil).

Would novecientos change if we were talking about a feminine currency?

Yes! The hundreds from 200 to 999 must match the gender of the noun they are counting. Since dólares is a masculine word, we use the masculine form novecientos. If you were counting a feminine currency like libras (pounds), it would change to novecientas libras.

Why is the verb for 'costs' cuesta instead of costa?