From Jo's spending pie chart, Books = 25% and Dress = 20% of the total.<br><br>
Let total spending be T. Books + Dress = 45% of T.<br>
But the total is read from the chart -- Jo spent a total of $400 at the mall.<br><br>
Books = 25% × $400 = $100. Dress = 20% × $400 = $80.<br>
Books + Dress = $100 + $80 = $180.<br><br>
Final Answer: 180