Percent error in chemistry help!?

So I've already calculated that the specific heat of zinc is 0.39 Now, I have this question and I have no idea how to solve it Use the given specific heat capacity values below to calculate the percent error of the experimental specific heat capacity that you determined in Part I of the lab. Known... show more So I've already calculated that the specific heat of zinc is 0.39
Now, I have this question and I have no idea how to solve it

Use the given specific heat capacity values below to calculate the percent error of the experimental specific heat capacity that you determined in Part I of the lab.

Known specific heat values — Iron: 0.444 J/g°C; Zinc: 0.390 J/g°C; Copper: 0.385 J/g°C, Aluminum: 0.900 J/g°C

| experimental - actual value | x 100 %
actual value
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