$$( 8.3 - 4 \frac { 7 } { 10 } ) \times ( - \frac { 5 } { 24 } )$$
$-0.75$
$$\left(8.3-\frac{40+7}{10}\right)\left(-\frac{5}{24}\right)$$
$$\left(8.3-\frac{47}{10}\right)\left(-\frac{5}{24}\right)$$
$$\left(\frac{83}{10}-\frac{47}{10}\right)\left(-\frac{5}{24}\right)$$
$$\frac{83-47}{10}\left(-\frac{5}{24}\right)$$
$$\frac{36}{10}\left(-\frac{5}{24}\right)$$
$$\frac{18}{5}\left(-\frac{5}{24}\right)$$
$$\frac{18\left(-5\right)}{5\times 24}$$
$$\frac{-90}{120}$$
$$-\frac{3}{4}$$
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