please help with this one

Additional Problem 03-04 (Algo) 21:46 K The table below shows actual and forecasted nubmers of accounts serviced by a company. Compute MAD, MSE, and MAPE for the following data, showing actual and forecasted numbers of accounts serviced. (Enter whole number values in the table below for Error, lErrorl, and Error 2. Round the Errorl/Actual to three decimals. Enter o where necessary, do not leave any cells blank. Negative values should be indicated with a minus sign, i.e.-2. Round MAD, MSE and MAPE to 3 decimal places.) Period Actual Forecast A-F(Error Error Error (Error/Actual) x 100 1 220 221 2 218 219 218 218 217 217 5 218 215 215 214 7 212 212 8 209 211 3 4 6 ces MAD MSE MAPE