Answer:
$39.75
Explanation:
First, you find the tax by dividing the cost of the plate by 100, and then multiplying your answer by the tax, 6.:
375/100 = 3.75
3.75*6 = 22.5.
Then add the shipping charges, 375 + 22.5 = 397.5. This is the total cost. SInce Frank sold the plate three years later for 10% more than the total cost, you find 10% of the total cost, and then add that 10% to $397.5
397.5/100 = 3.975
3.975*10 = 39.75
39.75 + 397.5 = 437.25.
To find the profit, subtract 397.5 from $437.25:
437.25 - 397.5 = 39.75.
The total profit is $39.75