Calculate the total charges given to three labourers for their earthwork excavation, with them working from 9 a.m. to 6 p.m. with an hourly working charge of ₹50.
- A₹450
- B₹350
- C₹1,350Correct
- D₹500
Solution
Concept
Total labour charge = number of labourers × hours worked × hourly rate.
Formula
Total charge = N × h × rate
Step-by-step solution
1. Working time = 9 a.m. to 6 p.m. = 9 hours. 2. Charge for one labourer = 9 × ₹50 = ₹450. 3. Charge for three labourers = 3 × ₹450 = ₹1,350.
Explanation
Each labourer works 9 hours at ₹50 per hour, so one labourer earns ₹450. Three labourers together earn 3 × 450 = ₹1,350.
Why the other options are wrong
A: ₹450 is the charge for only one labourer. B: ₹350 does not match any correct calculation. D: ₹500 does not match any correct calculation.
Shortcut
3 × 9 × 50 = 27 × 50 = ₹1,350
Common mistake
Counting hours as 8 instead of 9, or forgetting to multiply by 3 labourers.
Correct answer: C) ₹1,350