Discussion
Five people are planning to share equally the cost of a rental apartment. If one person withdraws from the agreement and others share equally the entire rental of the apartment, then the share of each of the remaining persons is increased by
Answer: B
The keyed answer is 5%.
With five people, each pays 1/5 = 20% of the rent. When one withdraws, each of the remaining four pays 1/4 = 25% of the rent. So each person's share of the total rent rises from 20% to 25%, that is, by 5 percentage points of the rent, which is the reading the key takes.
Measured against each person's own earlier payment, the increase is (25 - 20)/20 = 25%, which is not among the options; 4%, 6% and 7% fit neither reading.
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