Question 631193
Let x = cost in 1994 (in thousands of dollars)


So if it costs 18 thousand dollars now (in 2012) and it has "increased by 80% from 1994 to 2012", this means that



(Cost in 1994) + (80% of cost in 1994) = Cost in 2012


x + 80% of x = 18


x + 0.8x = 18


1.8x = 18


x = 18/1.8


x = 10


Remember that x is in thousands of dollars.


So the average cost to attend college in 1994 is <font color="red">$10,000</font>


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