Question
The current erection cost of a structure is Rs. 13,200. If the labour wages per day increase by
1/5 of the current wages and the working hours decrease by 1/24 of the current period, then
the
new cost of erection in Rs. is
Answer: Option B
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Let 'W' be the labour wages, and 'T' be the working hours.
Now, total cost is a function of `W` x `T`
Increase in wages = 20%
`:.` Revised wages = 1.2 `W`
Decrease in labour time = (`100/24`)%
`:.` Re vised time = (1 - `1/24`) `T` = `23/24` `T`
`:.` Revised Total cost = 1.2 x `23/24` `WT` = 1.15 `WT`
= 1.15 x 13200 = 15180
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