$$384=(100+15) \div 100 \times x$$
$x = \frac{7680}{23} = 333\frac{21}{23} \approx 333.913043478$
$$38400=\left(100+15\right)x$$
$$38400=115x$$
$$115x=38400$$
$$x=\frac{38400}{115}$$
$$x=\frac{7680}{23}$$
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