Your boss is the director of reporting for the Athens County Construction Agency $($ACCA$).$ It has been his job to track the cost of construction in Athens County. Twenty$-$five years ago he created the

$2-51$

ACCA Cost Index to track these costs. Costs during the first year of the index were $$12$ per square foot of constructed space $($the index value was set at $100$ for that first year$).$ This past year a survey of contractors revealed that costs were $$90$ per square foot. What index number will your boss publish in his report for this year? If the index value was $600$ last year, what was the cost per square foot last year?Your boss is the director of reporting for the Athens County Construction Agency $($ACCA$).$ It has been his job to track the cost of construction in Athens County. Twenty$-$five years ago he created the

$2-51$

ACCA Cost Index to track these costs. Costs during the first year of the index were $$12$ per square foot of constructed space $($the index value was set at $100$ for that first year$).$ This past year a survey of contractors revealed that costs were $$90$ per square foot. What index number will your boss publish in his report for this year? If the index value was $600$ last year, what was the cost per square foot last year?