[tex]1 \frac{3}{5} \times 5.15 - 1 \frac{3}{5} \times 4.05 = 1 \frac{3}{5} (5.15 - 4.05) = 1 \frac{3}{5} \times 1.1 = 1.6 \times 1.1 = 1.76[/tex]