Final answer:
The final price of the car stereo after a 20% and then an additional 60% discount from the original price of $375 is $120.
Step-by-step explanation:
To calculate the final price after both discounts, we start with the original price of the car stereo, which is $375. The first discount is 20% off.
To find the amount of the first discount, we multiply the original price by 20% (0.20). This gives us $375 × 0.20 = $75, which is the amount of the first discount.
The new price after the first discount is $375 - $75 = $300.
Now, they decide to take an additional 60% off the discounted price.
To find the amount of the second discount, we multiply the new discounted price by 60% (0.60). So, we get $300 × 0.60 = $180, which is the amount of the second discount.
Therefore, the final price after both discounts is $300 - $180 = $120.