CMA Foundation · Fundamentals of Business Mathematics and Statistics · Ratios, Variations and Proportions
The monthly electricity bill of a factory varies directly with the units consumed. If the bill is ₹4,800 for 600 units, what will the bill be for 850 units, assuming the same proportional relationship?
The bill is ₹6,800. Since the bill varies directly with units consumed, the rate is constant at ₹8 per unit (4,800 divided by 600), and multiplying this rate by 850 units gives ₹6,800.
- A₹6,400
- B₹6,800Correct
- C₹7,200
- D₹6,120
Explanation
Bill = k × units, so k = 4800/600 = 8 per unit. For 850 units, bill = 8 × 850 = ₹6,800. The option ₹6,400 comes from adding 250 units at a wrong rate of 6.4 and is not supported by the data.
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