plural( N1, deskItem( 0 ) ) cost $C.
Which equation would help determine the cost of plural( N2, deskItem( 0 ) )?
SOLUTION
\dfrac{N2}{\$C} = \dfrac{x}{N1}
\dfrac{N2}{N1} = \dfrac{\$C}{x}
\dfrac{N1}{N2} = \dfrac{x}{\$C}
\dfrac{x}{N2} = \dfrac{N1}{\$C}
\dfrac{N2}{x} = \dfrac{\$C}{N1}
There are several equations that could help determine the cost, each with a slightly different approach.
We can write the fact that plural( N1, deskItem( 0 ) ) cost $C as a proportion:
\dfrac{N1}{\$C}
Let x
represent the unknown cost of plural( N2, deskItem( 0 ) ). Since plural( N2, deskItem( 0 ) ) cost x
, we have the following proportion:
\dfrac{N2}{x}
The cost changes along with the number of deskItem( 0 )s purchased, and so the two proportions are equivalent.
Let x
represent the unknown cost of plural( N2, deskItem( 0 ) ). Since plural( N2, deskItem( 0 ) ) cost x
, we have the following proportion:
\dfrac{N2}{x}
We can write the fact that plural( N1, deskItem( 0 ) ) cost $C as a proportion:
\dfrac{N1}{\$C}
The cost changes along with the number of deskItem( 0 )s purchased, and so the two proportions are equivalent.
We know the cost of plural( N1, deskItem( 0 ) ), and we want to know the cost of plural( N2, deskItem( 0 ) ). We can write the numbers of deskItem( 0 )s as a proportion:
\dfrac{N1}{N2}
We know plural( N1, deskItem( 0 ) ) costs $C, and we can let x
represent the unknown cost of plural( N2, deskItem( 0 ) ). The proportion of these costs can be expressed as:
\dfrac{\$C}{x}
The cost changes along with the number of deskItem( 0 )s purchased, and so the two proportions are equivalent.
If we let x
represent the cost of plural( N2, deskItem( 0 ) ), we have the following proportion:
\dfrac{x}{N2}
We have to pay $C for plural( N1, deskItem( 0 ) ), and that can be written as a proportion:
\dfrac{\$C}{N1}
Since the price per folder stays the same, these two proportions are equivalent.
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