So,
1st year: 3 2nd year: 4(first year), which is 12 3rd year: 6(first year), which is 18
The sum of the 1st, 2nd, and 3rd years is 3 + 12 + 18 = 33
Now, multiply 33 by the price at which Mr. Jackson sold each computer ($185).
We get $6105. Mr. Jackson's gross profit was $6105.
Mr. Jackson sold a total of 33 monitors over three years. His total earnings from selling these monitors at $185 each came to $6,105.
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