[Grammar] helpful to/for

[kite]

Could you please help me to use a correct preposition?
"That knowledge will be helpful to my study."
"That knowledge will be helpful for my study."

Which preposition is correct? To or for?

Thanks.

 

[MikeNewYork]

Could you please help me to use a correct preposition?
"That knowledge will be helpful to my study."
"That knowledge will be helpful for my study."

Which preposition is correct? To or for?

Thanks.

Either works, but I prefer "for".