What? I don't understand the English sentence either. I
What does mennyi mean? Asking for the price?
The Hungarian sentence intends to ask what's the amount of the new rice in front of the speaker.
how much new rice is this? - why was this wrong? a capital letter?
In order to avoid the frustration and delay of wrong answers, I try to follow correct English orthography, with proper spelling (of course), capitalization, punctuation, spacing, etc.