In 2013, selected automobiles had an average cost of $15,500. the average cost of those same automobiles is now $17,205. what was the rate of increase for these automobiles between the two time periods?

11%

Explanation:

Average cost of automobiles in 2013 = $15,500

Average cost of automobiles now = $17,205

Change in average cost = $17,205 - $15,500

                                        = $1,705

Rate of increase in cost is the ratio between the increase and the average cost before the increase.

Rate of increase = ($1,705/$15,500) × 100%

                           = 11%

The rate of increase for these automobiles between the two time periods is 11%.

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