Data for January for Bondi Corporation and its two major business segments, North and South, appear below: Sales revenues, North $ 653,000 Variable expenses, North $ 378,900 Traceable fixed expenses, North $ 78,000 Sales revenues, South $ 503,600 Variable expenses, South $ 287,300 Traceable fixed expenses, South $ 65,200 In addition, common fixed expenses totaled $176,700 and were allocated as follows: $91,700 to the North business segment and $85,000 to the South business segment. A properly constructed segmented income statement in a contribution format would show that the segment margin of the North business segment is:

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.