19 The manager of the sporting-goods store raises the price of a basketball from $16.80
to $18.90. What is the percent of change?

12.5%

Step-by-step explanation:

% of change = the difference between the new price and the old price ÷ the old price × 100

=> % of change = (18.9 - 16.8) ÷ 16.8 × 100 = 12.5

=> The ans will be 12.5%

Variable

Step-by-step explanation:

The speed would always be changing, meaning varying. It would not be a static speed or constant speed.