Regarding the law of tithing produce, that after giving Terumah the produce is still Tevel until a tenth of the remainder is given to the Levi.
If someone had 100 stalks remaining after giving Terumah, each valued at $1, he would give 10 stalks to the Levi, which had the value of $10.
What about if someone had 75 stalks left after taking Terumah, 25 stalks worth $2 each and 50 stalks worth $1 each.
a) Can he give for Maaser Rishon 7.5 stalks, regarding of their value, and potentially only give the Levi the value of $7.5.
b) Must he give 2.5 stalks of the $2 batch, and 5 stalks of the $1 batch, valued together at $10
c) If b is correct, can he give 10 $1 stalks, which has the value of $10?