Jake’s roof repair has provided the following data concerning its costs:
- fixed cost per month cost per repair-hour
wages and salaries $ 23,200 $ 16.30
parts and supplies $ 8.60
equipment depreciation $ 1,600 $ 0.40
truck operating expenses $ 6,400 $ 1.70
rent $ 3,480
administrative expenses $ 4,500 $ 0.80
for example, wages and salaries should be $23,200 plus $16.30 per repair-hour. the company expected to work 2,800 repair-hours in may, but actually worked 2,900 repair-hours. the company expects its sales to be $44.50 per repair-hour.
required:
compute the company’s activity variances for may.

David consumes two things: gasoline (g) and bread (b). david's utility function is u(g, b) = 10g^0.25 b^0.75. use the lagrange technique to solve for david's optimal choices of gasoline and bread as a function of the price of gasoline, p_g, the price of bread, p_b, and his income m. with recent decrease in the price of gasoline (maybe due to external shock such as shale gas production) does david increase his consumption of gasoline? for david, how does partial differential g/partial differential p_g depend on his income m? that is, how does david's change in gasoline consumption due to an increase in the price of gasoline depend on his income level? to answer these questions, find the cross-partial derivative, |partial differential^2 g/partial differential m partial differential p_g.