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If the price of petrol is increased  by 30% , by how much percent  a car  owner  must  reduce  his consumption in order  to maintain the  same budget ?


Options:
A .  21 %
B .  `21 1/3` %
C .  `23 1/13`%
D .  33%
Answer: Option C

Decrease in consumption = `[(R)/((100 + R)) xx 100]`% = `(30/130 xx 100)`% =  `23 1/13`%.



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