Work backwards from the final price. The final price is 90% of the first discounted price, which is 70% of the original price.<br><br>\\(\begin{aligned}<br>\text{Let original price} &= x<br>\\<br>\text{After 30\% off} &= 0.70x<br>\\<br>\text{After additional 10\% off} &= 0.70x \times 0.90 = 0.63x<br>\\<br>0.63x &= \$189<br>\\<br>x &= \$189 \div 0.63 = \$300<br>\end{aligned}\\)<br><br>Final Answer: \$300