To find out how much money Jared has already paid his mother, we can start with the total cost of the amplifier and subtract the amount he still owes.
The total cost of the amplifier is $235, and Jared still owes $73 to his mom. Therefore, the amount he has already paid can be calculated as:
\[ 235 - 73 = 162 \]
So, the correct option that shows how much money Jared has already paid his mother is:
235 - 73 = 162.