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This problem trains for: SAT-I, AMC-8, GMAT, AMC-10.
Mr. Bozo has spent 60% of his money in the first day after he received the paycheck. The day after that, he spent another 10% of the remaining amount. In the third day, he spent another 5% of the remaining amount. What percentage of the paycheck has he spent in the third day?
(Groucho Marx "We're Mr. Bozos to you!")
After the second day, Mr. Bozo had 36% of his paycheck left:
After the third day, Mr. Bozo had 34.2% of his paycheck left:
Therefore, on the third day alone, Mr. Bozo spent 1.8% of his paycheck: