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[tex]a) \ \frac{3}{4}\cdot800=3\cdot200=\boxed{600}\\\\b) \ \frac{2}{5}\cdot150=2\cdot30=\boxed{60}\\\\c) \ 1\frac{3}{10}\cdot900=\frac{13}{10}\cdot900=13\cdot90=\boxed{1170}\\\\d) \ 2\frac{1}{2}\cdot300=\frac{5}{2}\cdot300=5\cdot150=\boxed{750}[/tex]
a) 3/4 * 800 = 3 * 200 = 600
b) 2/5 * 150 = 2 * 30 = 60
c) 1 3/10 * 900 = 13/10 * 900 = 13 * 90 = 1170
d) 2 1/2 * 300 = 5/2 * 300 = 5 * 150 = 750