1.A company bought a new laptop for Engr. Reyes - their new employee. The laptop was advertised to have an economic life of 8 years and at that point, it would cost 10% of its original price. Find the book value of the asset at its 4th year if it cost P35,000 initially.

2. A machine has first cost of P13,000, an estimated life of 15 years, and an estimated salvage value of P1,000. Using the straight-line formula, find: a.) the annual depreciation charge b.) the annual depreciation rate expressed as a percentage c.) the book value at the end 9 year.

3. A construction company decided to acquire a new delivery truck costing P1,200,000. The said truck is projected to last for 12 years and at that point it would cost P140,000. Find the book value at its 7th year if it is depreciated using sinking fund method at i=6.5%.

4. A plant erected to manufacture socks has a first cost of P10,000,000 with an estimated salvage value of P100,000 at the end of 25 years. Find its appraised value to the nearest P100 by the sinking fund method, assuming an interest rate at 6% at the end of: a.) 10 years b.) 20 years