Discuss Forum
1. In redesigning a cold storage, the length is increased by 30%, the breadth is increassed by 50% and the height is reduced by 20%. What is the net increase in the volume of the redesigned cold storage compared to the previous design?
- A. 50%
- B. 50%
- C. 50%
- D. 50%
Answer: Option B
Explanation:
Shortcut method:
±a±b±(ab/100)
=30+50+(30×50)/100
=95%
Now again,
±a±b±(ab/100)
=95-20-(95×20)/100
=56%
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