Samsung reported a staggering 20 percent drop in sales of its flagship smartphone, the Galaxy S5, for the last
three months. Profits declined even more—a 49 percent collapse from last year. The reason for this collapse: Apple's introduction of its large-screen iPhone 6 and price cuts on the iPhone 5. Apple dropped the price of the 16GB iPhone 5s from $199 to $99 and the 8GB iPhone 5s from $99 to a cool $0, with contract.
compute the percentage change in the 16GB iPhone 5s price, as computed from
A) Initial price as %
B) Final price as %
C) Average price as %