Question

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
consumed then the bill becomes Rs 2040. In another month 500 units are consumed due to more another month 620 calls are holidays. The bill for that month would be​

Answer 1

Answer:

1680

Step-by-step explanation:

Let the fixed amount be Rs. X and the cost of each unit be Rs. Y.

    Then, 540y + x = 1800 …. And 620y + x =  2040

    On subtracting (i) from (ii), we get 80y = 240 -> y = 3

    Putting y = 3 in (i) we get :

    540 * 3 +  x = 1800 x = (1800-1620) = 180

    . :  Fixed charges = Rs.180, Charge per unit = Rs.3.

    Total charges for consuming 500 units = 180 +(500*3) = Rs.1680

Answer 2

According to the question;

let the fixed charge be Rs. x

and let the cost per unit be Rs. y

now, according to the question;

(i) 540y + x = 1800

(ii) 620y + x = 2040

On subtracting (i) from (ii) we get;

-80y = -240

80y = 240

y = 3

now put y = 3 in (i), we get;

540y + x = 1800

540(3) + x = 1800

1620 + x = 1800

x = 1800 - 1620

x = 180

hence,

fixed charge = Rs. 180 and cost per unit = Rs. 3

now, total charges for consuming 500 unit

= 180 + (500 × 3)

= 180 + 1500

=1680

The telephone bill of a certain establishment is partly fixed and partly varies as the number of calls consumed When in a certain month 540 calls are made the bill is Rs 1800 in consumed then the bill becomes Rs 2040. In another month 500 units are consumed due to more another month 620 calls are holidays. The bill for that month would be​ Rs. 1680.

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