Let's break down the cost of four shirts under Isaac's deal.
- The price of one shirt is \(12.75\).
- When Isaac buys one shirt at full price, he gets a second shirt for 20% off.
First, we'll calculate the price of the second shirt with the discount:
20% of \(12.75\) is calculated as follows: \[ 0.20 \times 12.75 = 2.55 \]
So, the price of the second shirt after the discount is: \[ 12.75 - 2.55 = 10.20 \]
Now, we can calculate the total cost for two shirts:
- The first shirt costs \(12.75\).
- The second shirt costs \(10.20\).
The total cost for two shirts is: \[ 12.75 + 10.20 = 22.95 \]
Since Isaac wants to buy four shirts, he can repeat this deal:
- Buy two shirts (full price and discounted).
- He will buy another two shirts in the same manner.
Thus, the total cost for four shirts is: \[ 22.95 + 22.95 = 45.90 \]
Therefore, the total amount Isaac pays for four shirts is \(\text{$45.90}\).
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