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It costs Rs. p each to send the first thousand messsages and Rs. q to send each subsequent one . If r is greater than 1,000, how many Rupees will it cost to send r messages ?

Correct Answer: 1000(p - q) + qr

Explanation:

We need to find the total cost to send r messsages, r > 1000.


The first 1000 messsages will cost Rs.p each (Or) 


The total cost of first 1000 messsages = Rs.1000p


The remaining (r - 1000) messsages will cost Rs.q each (Or)


The cost of the (r - 1000) = Rs.(r - 1000)y


 


Therefore, total cost = 1000p + rq - 1000q


= 1000(p - q) + qr


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