Answer:
0.85 x
Step-by-step explanation:
Let "x" be the original price of the sound system in dollars. First, we have to calculate 15% of x.
15% x = 15/100 . x = 0.15 x
Then we have to subtract this to the original price.
x - 0.15 x
We can take out the common factor "x".
x . (1 - 0.15) = 0.85 x
The final price can be found with the expression 0.85 x