Answer quick plz Zachary used the calculations shown to find how much he would spend on 16 ounces of pistachios.

6 ounces of pistachios cost $7.50
StartFraction 7 dollars and 50 cents Over 6 ounces EndFraction = StartFraction dollar-sign question mark Over 1 ounce EndFraction
Unit price = $0.80 per ounce

What was his first error?
The price per ounce should have been $45.00 per ounce.
The price per ounce should have been $1.25 per ounce.
The final cost should have been $20.00.
The final cost should have been $16.80.