The price of an article is decreased by 10%. To restore its former value the new price must be increased by :
Options:
A . 11%
B . 11$1/9$%
C . 9$1/11$%
D . 10%
Answer: Option B Answer: (b) Let the original price be Rs.100 New price after 10% decrease = Rs.90 In order to restore the price to its original value, it must be increased by Rs.10 % increase = $10/90 × 100 = 100/9 = 11{1}/9%$ Using Rule 9, If ‘x' is A% less than ‘y', then y is more than ‘x' by Required% = $(A/{(100 - A)} × 100)%$(increase)
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