WILL RATE ASAP KINDLY ANSWER ALL QUESTIONS ON EXCEL THANK YOU

A. DDBM: A construction company decided to purchase a concrete mixer truck for $75,000 with a trade-in of their old mixer. The old mixer has a trade-in value of $7,000. The new mixer will be kept for 15 years before being sold. Its estimated salvage value at that time is expected to be $5,000. Assume interest to be 12%. Determine the 8th year BVB by Double Declining Balance Method (round-off k to 4 decimal places).

B. DDBM: A property that is book-depreciated over a 10-year period by the Double Declining Balance Method has $35,840 book value on the 3rd year. Determine the first cost of the property (round-off k to 4 decimal places).