An apartment measures 15m in length, 4m in width, and 3m in height. Compute the expense to apply whitewash across its four interior surfaces at a rate of 50p per m2?
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Answer: B. Rs.57
Explanation
The lateral surface area of the four interior walls equals one hundred fourteen square meters. Multiplying the total wall area by fifty paisa per square meter gives fifty seven rupees. The calculation accurately accounts for the dimensions of length, width, and wall height. Lateral surface area of a rectangular room is calculated using twice the height times length plus width. Currency conversions require multiplying area measurements by the specified cost rate per unit. Interior painting estimates rely strictly on wall surface area excluding floors and ceilings.
Painters and contractors calculate wall surface area to estimate material costs for room renovations. Wallpaper manufacturers use room dimensions to help customers determine how many rolls to purchase. Interior designers evaluate surface areas when budgeting for wall treatments and acoustic paneling. Option A overestimates the total cost due to rounding errors in the area calculation. Option C results from miscalculating the perimeter sum of the room's length and width. Option D underestimates the total expenditure by using an incorrect multiplier for the area.
- Subject
- Mathematics
- Category
- Mathematics
- Topic
- —
- Difficulty
- medium
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