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It was calculated that 75 men could complete a piece of work in 20 days

It was calculated that 75 men could complete a piece of work in 20 days. When work was scheduled to commence, it was found necessary to send 25 men to another project. How much longer will it take to complete the work?
Answer: 30 days. 
Explanation: Before: One day work = 1 / 20 
One man’s one day work = 1 / ( 20 * 75) 
Now: No. Of workers = 50 
One day work = 50 * 1 / ( 20 * 75)
 The total no. of days required to complete the work = (75 * 20) / 50 = 30

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The telephone bill of a certain establishment is party fixed and partly varies as the number of calls consumed. When in a certain month 540 calls made the bill is Rs.1800. In another month 620 calls are consumed then the bill becomes Rs.2040. In another month 500 units are consumed due to more holidays. The bill for that month would be :

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