Q. The minimum charge of telephone per month upto 100 calls is Rs 180 then the cost is Rs 3 per call of 4 minutes. A family paid Rs 1188 as telephone charge including 10% VAT. Find the total number of calls made.

Soln:

Here, the minimum charge for 100 calls = Rs 180

Let the charge for telephone calls without VAT = Rs x

So, x + 10% of x = 1188

(11/10)*x = 1188

x = 1080

Now, charge for extra calls = Rs 1080 - Rs 180 = Rs 900

Then, the number extra calls = Rs 900 / Rs 3 = 300

Hence, total number calls = no. of minimum calls + no. of extra calls = 100 + 300 = 400.

Note: I assume that duration of each call is 4 minutes, which is not mentioned in the question, I think duration of a call should be given in the question. If you find anything wrong, comment below and do let me know.

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