Idaho Inc. acquired a piece of machinery on January 1, 2010. The total cost of the machinery was $108,400. Idaho estimated that the machinery would be used to produce 100,000 units of product before being sold for an estimated $18,600 at the end of 10 years. Idaho uses the units-of-production method of depreciation. Assuming the machine produced 12,000 units in year 2010, 9,000 units in year 2011, and 10,500 units in year 2012, what was the balance of accumulated depreciation at year-end 2012 ?

Stocks a, b, and c are similar in some respects: each has an expected return of 10% and a standard deviation of 25%. stocks a and b have returns that are independent of one another; i.e., their correlation coefficient, r, equals zero. stocks a and c have returns that are negatively correlated with one another; i.e., r is less than 0. portfolio ab is a portfolio with half of its money invested in stock a and half in stock b. portfolio ac is a portfolio with half of its money invested in stock a and half invested in stock c. which of the following statements is correct? a. portfolio ab has a standard deviation that is greater than 25%.b. portfolio ac has an expected return that is less than 10%.c. portfolio ac has a standard deviation that is less than 25%.d. portfolio ab has a standard deviation that is equal to 25%.e. portfolio ac has an expected return that is greater than 25%.