c. Using the midpoint formula, a decrease in price from $60 to $50 per bathing suit represents a(n) decrease in price.

18.18% decease

Explanation:

The Midpoint formula uses the average Price (as denominator) to calculate the change in price instead of the original price by the following formula;

% Decrease in price = Change in price / Average price

= (50 - 60) / ((60 + 50)/2)

= -10 / (55)

= -0.1818

= -18.18%

Using the midpoint formula, a decrease in price from $60 to $50 per bathing suit represents an 18.18% decrease in price.

explanation:

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