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Hi nandini14,

Great question, and it comes down to what "shares a terminus" actually means in the setup.

The rule (from the New Flight Lines tab) is: adding a new line cuts revenue by 10% only on the lines that share a terminus with the new line. A terminus is one of the new line's two endpoint cities - nothing more. So for a proposed line, you look at each of its two cities and count only the existing lines that literally touch one of those two cities.

Take Line AD (the case in Q2). Its two termini are A and D:
- Lines touching A: A-B ($33.1M) and A-C ($18.7M)
- Lines touching D: B-D ($18.1M)

Now look at the two lines you asked about, both from the Current Flights diagram:
- B-C ($27.3M) - its endpoints are Bionia and Cordell. Neither is A or D, so it does not share a terminus with AD - not affected.
- C-E ($17.6M) - its endpoints are Cordell and Epster. Again, neither is A or D - not affected.

The trap is thinking in terms of the network - "A connects to C, and C connects to B and E, so those matter too." But the reduction isn't about routes or reachability; it's only about lines that end at one of the new line's two cities. B-C and C-E don't end at A or D, so they're untouched.

Quick way to lock it in: picture a hub at just city A. Only the spokes plugged into A lose revenue. A line sitting two hops away, between two other cities, never plugs into A - so it's out. Apply that same "does it plug into A or D?" test to every existing line and you'll always pick the right set.

Answer: Yes, Yes, No

nandini14
KarishmaB

Why didn't we consider B to C or C to E

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For the first question, why is it that we rake annual revenue and not annual revenue adjusted for one time cost, since the question mentions "total revenue"?
ManishaPrepMinds
1)

Revenue Condition: Annual revenue > $20 million

Connectivity Condition:Travel between ANY two cities using at most 2 flights

Line Projected Annual Revenue (>$20M)
Connectivity between any two cities (≤2 flights )
Answer
AD $20.1M > $20M Epster→Dewark still 3 flights ( E→C→B→D)NO (fails second requirement)
BE $18.8M < $20M fails first requirement NO ( fails first requirement)
DE $29.1M > $20M all pairs ≤2 flights YES

2)

Flight Line Proposed Revenue

Revenue Loss (10% of the annual revenue provided by all flight lines that share a terminus )
Net Revenue >$10M? Answer
AD$20.1M 10% of ($33+$19 +$18) = $7M $20.1 - $7 = $13.1M YESYES
AE$17.210% of ( $33+$18+17) = 7M$17.2 - $7 =10.2MYESYES
BE $18.810% of (33 +18 +27 +17) =9.6M$18.8 - 9.6 =9.2M NO NO


3)
Eliminate anything >$13M( implementation budget)
Eliminate Flight lines
BE ($15.4M)
CD ($20.1M)

Remaining: AD, AE, DE
total flight time between Cordell and Dewark
Cordell → Bionia → Dewark = 96 + 78 = 174 minutes

Lines, if implemented, would minimize the total flight time between Cordell and Dewark
AD: Creates New Route C->A→D = 63+85 = 148 min
AE: Doesn't help to create new Route
DE: Creates New Route C→E→D= 57+174 = 231 min

Answer: Line AD




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abhikc3004
For the first question, why is it that we rake annual revenue and not annual revenue adjusted for one time cost, since the question mentions "total revenue"?
In this type of simple context, cost does not affect revenue.

Revenue is simply incoming funds.
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