The incremental borrowing rate for Proton Motors Ltd is 10%. The corporate tax rate is 30%. we are Proton Motors Ltd acquire company lease answer .. Proton Motors Ltd is per cent company of Electron. At the beginning of the current period, Proton Motors Ltd sold some old machinery to Electron Ltd for $81,000. The machinery originally cost Proton Motors Ltd $500,000, is four years old and had accumulated depreciation of $400,000 at the date of the sale. The remaining useful life of the machinery was confirmed by independent experts engaged by Electron Ltd to be a further two years. The Chief Accountant was mumbling something about not recording these transactions. Wont the accounts then be incomplete?