Here are the steps to record the transactions:
1. On January 1, 2007 when the trucks were purchased, record a debit to Trucks account (an asset account) for Rs. 800,000 (Rs. 400,000 for each truck) and credit to Cash/Bank account or M/s Popular Auto Pvt Ltd A/c (liability account) for Rs. 800,000.
2. On March 1, 2007 when the price of trucks went down, pass a journal entry debiting Loss on Trucks account (a nominal account) for Rs. 25,000 (Rs. 12,500 for each truck) and crediting Trucks account for Rs. 25,000.
3. For Mr