Brian spent a total of $78 while shopping, $22 of which he spent on tank tops.
The total spent is $78, which represents 100% of the money spent.
To determine the percentage spent on the tank tops you can use cross multiplication:
$78 → 100%
$22 → x %
Both relationships are at the same ratio so that:
![(100)/(78)=(x)/(22)](https://img.qammunity.org/2023/formulas/mathematics/college/mshhlngcpmown627dthoo3gorquf4ece0b.png)
Multiply by 22
![\begin{gathered} 22\cdot(100)/(78)=22\cdot(x)/(22) \\ 28.2=x\to x\cong28 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/4657w5iemooa2rvhgjlp6b36sgclnt4yca.png)
He spent 28% of his purchase on tank tops.