Marta's customer bought 4 large oranges at $0.75 each and 8 small oranges at $0.50 each plus tax was a total of $7.49. She used t to represent the amount of tax. Explain her errors in the diagram. 2-3 sentences.
t (on top)
7.49 (on left)
0.75(8) (in middle)
0.50(4) (on left)