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Well, you will find the explanation below in the pictures.

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Q1a) The ingredient that costs the least when purchased fresh has the highest percentage increase in cost per ounce when switching from purchasing wholesale to purchasing fresh.
A1a) We observe that the least cost (Fresh) is the least for Oregano and the % change (WS to Fresh) is also highest for Oregano = 200%.
So, answer is YES.
For info, Cost (WS) per ounce, in same sequence is = 0.2, 0.05, 0.08, 0.03, 0.06, 0.1;
Cost (Fresh) per ounce, in same sequence is = 0.3, 0.15, 0.1, 0.05, 0.12, 0.11;
% Change (WS to Fresh), in same sequence is = 50%, 200%, 25%, 66.67%, 100%, 10%.

Q1b) The menu item with the lowest sales price has the highest ratio of net profit to cost of ingredients.
A1b) Clearly, the lowest SP on the menu is of Taco = 4, while the highest ratio of NP/CP is of Pasta = 3.67%.
So, answer is NO.
For info, ratio of NP/CP, in same sequence is = 2.63, 2.2, 3.67, 2.56, 2.43

Q1c) The menu item with the highest net profit has the highest markup (sales price divided by cost of ingredients).
A1c) Menu item with highest NP is Pizza = 7.25, while highest MP is of Pasta = 4.67
For info, MPs (SP/CP), in same sequence is = 3.63, 3.2, 4.67, 3.56, 3.43
So, answer is NO.

Q2) What is the probability that obtaining an ingredient fresh from a local farm will increase the cost per ounce for that ingredient by more than 75%?
A2) As mentioned earlier in explanation of (1a), % Change (WS to Fresh), in same sequence is = 50%, 200%, 25%, 66.67%, 100%, 10%.
We observe that only for 2 (viz. Oregano & Onion) out of total 6 ingredients - %change is more than 75%.
Hence answer is 2/6=1/3 => Option b

Summarising,
1a) Yes
1b) No
1c) No
and
2 b
:please:
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