Answer:
U.S. GDP increase by $29.99
Explanation:
given data
buy new iClicker 2 from bookstore for $29.99
used iClicker 2 online = 10
to find out
How much does U.S. GDP increase by
solution
we know that GDP is only include value of good and service produce during the certain period of time
and here we buy new iClicker 2 from the Illinois bookstore at $29.99 is only part of U.S. GDP
but when used iClicker 2 online is at $10 is not the part of U.S. GDP
so we can say U.S. GDP increase by only at $29.99
so U.S. GDP increase by $29.99