Correct option is C
Given:
The bill has a fixed part and a variable part (dependent on units consumed).
When 540 units are consumed, the bill = Rs. 1800.
When 620 units are consumed, the bill = Rs. 2040.
Formula Used:
Total Bill = Fixed Charge + (Variable Charge per Unit × Number of Units Consumed)
Solution:
Let the fixed charge be F and the variable charge per unit be V.
For 540 units:
F + 540V = 1800………..(i)
For 620 units:
F + 620V = 2040………….(ii)
Subtract the first equation from the second:
(F + 620V) - (F + 540V) = 2040 – 1800
80V = 240
V = 3
Substituting V = 3 into the first equation:
F + 540 × 3 = 1800
F + 1620 = 1800
F = 1800 – 1620 = 180
Now, the bill for 500 units:
Total Bill = F + 500 × V = 180 + 500 × 3=180 + 1500 = Rs.1680
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