Hideously Easy Peasy Challenge
An ugly man has $50 and needs to spend a grand total of half of triple of $50 on Saturday night in order to be beautiful. Today is Monday. How much more money would he need for Saturday night if 80% of his $50 was stolen on Wednesday, 50% of his remaining money was stolen on Friday, and 35% of his original $50 was added to the money he had left by Saturday morning?
Challenge: Can you solve in under a minute with no calculator?
The answer is 52.50.
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1 solution
Half of triple of $50: 3(50)/2=$75. He needs to spend $75 to be beautiful. He lost 80% of his $50: 50(0.2)=$10 left after having the money stolen. He lost 50% of the remaining money (which was $10): 10(0.5)=$5. Then, he gained 35% of $50: 50(0.35)=$17.50. Now, $17.50+$5=$22.50. He needs to spend $75. Therefore he needs $75-$22.50 more, or simply, $52.50 more.