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09 Aug 2019, 00:51
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Difficulty:
45%
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76% (03:19) correct
24%
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[GMAT math practice question]
Last month, the selling price of a certain product was $12. This month, the product’s price was cut by 20%. 165 more units of the product were sold this month than last month, and the total sales of the product this month were $420 higher than last month. How many units of the product were sold last month?
A. 400
B. 445
C. 485
D. 500
E. 520
Last month, the selling price of a certain product was $12. This month, the product’s price was cut by 20%. 165 more units of the product were sold this month than last month, and the total sales of the product this month were $420 higher than last month. How many units of the product were sold last month?
A. 400
B. 445
C. 485
D. 500
E. 520
09 Aug 2019, 01:07
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0.8×12%=9.6$
(X+165)×9.6=420+12X
2.4X=1164
X=485
Option C
Posted from my mobile device
(X+165)×9.6=420+12X
2.4X=1164
X=485
Option C
Posted from my mobile device
09 Aug 2019, 01:34
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Product SP last month: $12
Units sold last month : x
Product SP this month : 80% of $12 = $9.6
As sales of the product this month were $420 higher than last month and number of units sold 165 more than last month:
Equation is as follows:
12x - 9.6(x+165) =420
2.4x = 1164 => x = 485
Answer: option C
Units sold last month : x
Product SP this month : 80% of $12 = $9.6
As sales of the product this month were $420 higher than last month and number of units sold 165 more than last month:
Equation is as follows:
12x - 9.6(x+165) =420
2.4x = 1164 => x = 485
Answer: option C
