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Notebook

CP= 25
SP= 30
sold = x

profit 5x

planner

CP= 12
SP=20
sold=140-x

profit= 8(140-x)= 1120-8x

profit = 5x+ 1120-8x >900
220 > 3x
x< 73.33?

S-1
planner profit < notebook profit
1120-8x < 5x
1120 < 13x
x> 86.15

this gives yes or no both. not sufficient.

S-2
30x> (140-x)20
30x> 2800-20x
50x> 2800
x> 56

this also gives yes/ no.
not suffficient.

S 1& 2

56<x<86

it can be less than 73 or greater than 73. no definite ans.

choice E
Bunuel
A stationery shop sells only notebooks and planners. Each notebook sells for $30 and costs the shop $25, while each planner sells for $20 and costs the shop $12. In June, the shop sold 140 notebooks and planners in total. Was the shop’s profit from these sales more than $900?

(1) The shop’s profit from planners was less than its profit from notebooks.

(2) The shop’s revenue from notebooks was greater than its revenue from planners.

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This took a lot of time in testing cases. Is there a faster way to do it?

What I did -
We know N+P=140
Notebook - Cost - 30 ; Sell - 25; Profit - 5
Planner - Cost - 20 ; Sell - 12; Profit - 8

1. 5N>8P
5N>8(140-N)
N>86.something

After testing cases. Sufficient

2. 30N>20P
30N> 20(140-N)
N>56

Testing cases it shows different results. Not sufficient

Answer A
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Hi officiisnobis,

Good news: your setup is already spot on. The trial-and-error can be dropped entirely with one observation you almost had.

Write total profit as a single expression in one variable. Using your notebook count x:

Profit = 5x + 8(140 - x) = 1120 - 3x

This is a straight line that decreases as x grows. That's the whole trick: because profit moves in one direction with x, you never have to test random cases - you only ever check the endpoints of the range each statement allows.

Statement (1)

You got x > 86.15, so x ≥ 87. Since profit falls as x rises, the biggest possible profit sits at the smallest x:

- x = 87 - profit = 1120 - 261 = 859

Even the best case is under 900, so every case is under 900. Definite No - sufficient. No case-hunting - just plug the boundary.

Statement (2)

Here x > 56, so x ranges from 57 up to 140. Check the two ends:

- x = 57 - profit = 1120 - 171 = 949 (Yes, > 900)
- x = 140 - profit = 1120 - 420 = 700 (No, < 900)

Two endpoints, two different answers - not sufficient.

The takeaway: once profit (or any quantity) is a monotonic expression in a single variable, the extreme answers always live at the ends of the allowed interval. Test the boundaries, not scattered guesses - that's what turns this into a 30-second problem.

So the answer stays A, reached with zero guessing.

Answer: A

officiisnobis
This took a lot of time in testing cases. Is there a faster way to do it?

What I did -
We know N+P=140
Notebook - Cost - 30 ; Sell - 25; Profit - 5
Planner - Cost - 20 ; Sell - 12; Profit - 8

1. 5N>8P
5N>8(140-N)
N>86.something

After testing cases. Sufficient

2. 30N>20P
30N> 20(140-N)
N>56

Testing cases it shows different results. Not sufficient

Answer A
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