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附题，Marginal Analysis: Tables. Sarah Berra is a regional sales representative for Dental Laboratories, Inc. Berra sells alloy products created from gold, silver, platinum, and other precious metals to several dental laboratories in Maine, New Hampshire, and Vermont. Berra's goal is to maximize her total monthly commission income, which is figured at 10% of gross sales. In reviewing her monthly experience over the past year, Berra found the following relations between days spent in each state and monthly sales generated:
| | Maine | New Hampshire | Vermont |
Days | Gross Sales | Gross Sales | Gross Sales |
0 | $4,000 | 0 | $2,500 |
1 | $10,000 | $3,500 | $5,000 |
2 | $15,000 | $6,500 | $7,000 |
3 | $19,000 | $ 9,000 | $ 8,500 |
4 | $22,000 | $10,500 | $ 9,500 |
5 | $24,000 | $11,500 | $10,000 |
6 | $25,000 | $12,000 | $10,000 |
7 | $25,000 | $ 12,500 | $10,000 |
A. Construct a table showing Berra's marginal sales per day in each state.
B. If administrative duties limit Berra to only 10 selling days per month, how should she spend them?
C. Calculate Berra's maximum monthly commission income.
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