In the expression xy2, the values of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by
(a)
40%
(b)
48.8%
(c)
51.2%
(d)
80%
In the expression xy2, the values of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by
(a)
40%
(b)
48.8%
(c)
51.2%
(d)
80%
Question ID - 57313 | SaraNextGen Top Answer
In the expression xy2, the values of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by
(a)
40%
(b)
48.8%
(c)
51.2%
(d)
80%
|
In the expression xy2, the values of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by |
|
|||||||
|
(a) |
40% |
(b) |
48.8% |
(c) |
51.2% |
(d) |
80% |
|
1 Answer
127 votes
Answer Key / Explanation : (b) -
Let X and Y denote the new values of 
and 
respectively.
Then, X = 80% of 
Y =80% of 
Decrease in the value = 
.
Decrease % = 
% = 48.8%.
127 votes
Answer Link
127