Correct option is A
Given:
Decrease in length and breadth = 10% and 20%
Increase in height = 30%
Formula Used:
Volume of cuboid =
where L,B and H are length, breadth and height of cuboid respectively
Solution:
Let the length, breadth and height of cuboid initially be l,b and h respectively
Then volume = lbh
Then decreased length = l - 20% of l = 0.9l
Decreased breadth = b - 20% of b = 0.8b
Increased height = h + 30% of h = 1.3h
New Volume = (0.9l)(0.8b)(1.3h) = 0.936lbh
Change in volumle = lbh - 0.936lbh = 0.064lbh
Percent change = decrease
Alternative Method:
Successive Percentage =
= -30 + 2 = -28%
Now successive formula with -28% and +30%
= 2 - 8.4
= -6.4%
Negative sign means decrease in percentage
English
80 Questions
160 Marks
60 Mins
