Answer:
$768 is the value of the piano after 2 years.
Step-by-step explanation:
First you need to find 20% of 1,200. To do so you would need to set up a proportion.
[tex]\frac{20}{100}[/tex] = [tex]\frac{x}{1200}[/tex] 20 x 1,200 = 24,000/100 = 240
Now, subtract that amount from the original 1,200 to get the amount after one year.
1,200 - 240 = 960.
Next, you need to find 20% of 960 again setting up a proportion.
[tex]\frac{20}{100}[/tex] = [tex]\frac{x}{960}[/tex] 20 x 960 = 19,200/100 = 192
Finally, subtracting this amount from it's new value.
960 - 192 = 768