instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: what is the units digit of 17 ^ 83 13 ^ 82 11 ^ 67 ?
answer:
4

question:
Problem: robert ' s salary was decreased by 20 % and subsequently increased by 20 % . how much percentage does he lose ?
answer:
4 %

question:
Problem: the cost of a one - family home was $ 120,000 in 1980 . in 1988 , the price had increased to $ 180,000 . what was the percent increase in the cost of the home ?
answer:
50 %