Final answer:
To find out how much Jack earns now, we need to calculate his 10% increase. Jack's original salary was $56,000. Jack now earns $61,600.
Step-by-step explanation:
To find out how much Jack earns now, we need to calculate his 10% increase. Firstly, we find 10% of Jack's salary by multiplying $56,000 by 0.10, which gives us $5,600. Then, we add the increase to Jack's original salary by adding $5,600 to $56,000. Thus, Jack now earns $61,600.