In the first episode of season 1, where Guddu and Bablu are in the class the professor asks Guddu to say the next entry of balance sheet.
You could notice that the details of the 5th row "Depreciation", the details changes 5 times in the same.
1st - Depreciation ( on 7500) 2nd - Depreciation ( 4% on 7500) 3rd - Depreciation ( in 3yrs) 4th - It changes back to Depreciation ( 4% on 7500) 3rd - Again changes to Depreciation ( in 3yrs)
1st - Depreciation ( on 7500) 2nd - Depreciation ( 4% on 7500) 3rd - Depreciation ( in 3yrs) 4th - It changes back to Depreciation ( 4% on 7500) 3rd - Again changes to Depreciation ( in 3yrs)