Jamal currently earns $20,000 a year in gross wages. On January 1, he is due to receive a 2% COLA. What will his gross income be after the COLA takes effect?

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2% is 2/100. So the COLA increase is (2/100)x20000 = 40000/100 = 400. So his salary after the increase is 20000 + 400 = ...