To find out how much money Tyrell has saved, we need to calculate seven tenths of the total amount he wants to save, which is 50 dollars.
We can do this by multiplying 50 by \( \frac{7}{10} \):
\[ \text{Amount saved} = 50 \times \frac{7}{10} = 50 \times 0.7 = 35 \]
So, Tyrell has saved 35 dollars.