What was a centain company's revenue last year?
1) Last year the company's gross profit was 4,100
2) LAst year the company's revenue was 50% greater than its expenses
Why is the anwser OA C can someone explain please!
revenue
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- stevestein
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The answer is (C) because both pieces of information are required to determine last year's revenue:
Revenue - Expenses = Gross Profit
(1) Provides us with this piece of the equation:
Revenue - Expenses = 4100
(2) Provides us with this information:
Revenue = 1.5 x Expenses
Together, the two pieces of information provide for the following substitution:
Revenue - Expenses = 4100
(1.5 x Expenses) - Expenses = 4100
.5 x Expenses = 4100
Expenses = 8200
Revenue - 8200 = 4100
Revenue = 12,300
Revenue - Expenses = Gross Profit
(1) Provides us with this piece of the equation:
Revenue - Expenses = 4100
(2) Provides us with this information:
Revenue = 1.5 x Expenses
Together, the two pieces of information provide for the following substitution:
Revenue - Expenses = 4100
(1.5 x Expenses) - Expenses = 4100
.5 x Expenses = 4100
Expenses = 8200
Revenue - 8200 = 4100
Revenue = 12,300
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- Stuart@KaplanGMAT
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Let's stop right here and use my favourite DS tool: number of equations vs number of unknowns.stevestein wrote:The answer is (C) because both pieces of information are required to determine last year's revenue:
Revenue - Expenses = Gross Profit
(1) Provides us with this piece of the equation:
Revenue - Expenses = 4100
(2) Provides us with this information:
Revenue = 1.5 x Expenses
Here's the MOST important rule to know and love for DS:
To solve a system of n variables, one requires n distinct linear equations.
Learn that rule. Hug that rule. Love that rule so much that you marry it!
Q Stem: 1 equation, 3 variables.
(1) 1 more equation, doesn't eliminate the 2 variables we don't want: insufficient.
(2) 1 more equation, doesn't eliminate the 2 variables we don't want: insufficient.
Together: 3 variables, 3 distinct linear equations. We have enough information to answer ANY question about the system: sufficient, choose (C).
Note that no math was harmed in the solving of this question!
Stuart Kovinsky | Kaplan GMAT Faculty | Toronto
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