Find the Percentage ???
Q: If the price of oil increases by 25%, by what percentage should its consumption be reduced so that the total expenditure on oil does not increase ?
Options: (a) 16% (b) 24% (c) 25% (d) 20%
Solution:
When the price increases by 25%, the new price becomes 125 (from 100).
To keep the total cost constant:100 / 125×100 = 80
Thus, consumption must be reduced by 100 - 80 = 20%
=============================================
Q. The value of a machine depreciates at 10% per annum. What is the total percentage depreciation after 2 years ? āĻāĻāĻž āĻ¯āĻ¨ā§āĻ¤ā§ā§°ā§° āĻŽā§āĻ˛ā§āĻ¯ āĻŦāĻā§°āĻŋ 10% āĻšāĻžā§°āĻ¤ āĻāĻŽā§āĨ¤ 2 āĻŦāĻā§°ā§° āĻĒāĻŋāĻāĻ¤ āĻŽā§āĻ āĻāĻŋāĻŽāĻžāĻ¨ āĻļāĻ¤āĻžāĻāĻļ āĻŽā§āĻ˛ā§āĻ¯āĻšā§ā§°āĻžāĻ¸ āĻš'āĻŦ ?
A. 21% B. 19% C. 22% D. 20%
Trick | āĻā§ā§°āĻŋāĻ
Successive Percentage Formula (āĻ§āĻžā§°āĻžāĻŦāĻžāĻšāĻŋāĻ āĻļāĻ¤āĻžāĻāĻļā§° āĻ¸ā§āĻ¤ā§ā§°:): a + b − ab/100
For depreciation: 10 + 10 −10 × 10 / 100 = 20 − 1 = 19%
Ans | āĻāĻ¤ā§āĻ¤ā§° : B. 19%