Correct Answer: C
Explanation:
Set up the following ratio
50/500 = n/100
The cost of the tablet decreased by $50. The original cost is $500; therefore, 50 is the numerator and 500 is the denominator on the left side of the ratio.
Since a percentage is a part of a whole, n symbolizes the percentage decrease.
To solve for n, you can cross multiply. So, 50(100) = n(500).
n = 10%