A website Maths Puzzle Numerical Ability Profit and Loss

A shopkeeper allows 25% discount on the marked price of his articles and hence gains 25% of the Cost Price. What is the marked price of the article on selling which he gains Rs. 120?

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Rs. 800

Gain=Rs. 120=25% of CP, so CP=120x(100/25)=Rs. 480
SP=CP+Gain=480+120=Rs. 600
Here, SP=75% of MP
=> 600 = (75/100)xMP
MP =Rs. 800
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A website Other Question

If s = 2 - 2^

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- 6s^2 + 18^s + 18). Raman, Naman and Aman are roommates and were given a job to clean their room on Sundays. The job was easy, but they made it complicated. Sometimes they did it in pairs, sometimes individually, sometimes they did it all together. At the end of the month, a mathematician had following observations:
1. Aman needed 1 hour less than Raman to complete the work.
2. When they all worked together, they required 60 minutes to do complete job.
3. When Raman and Naman started working together and Raman left after 1 hour, then Naman had to work further for 3 more hours to complete the job.
The mathematician wants you to calculate how much work does Aman do per hour?