A painter takes 20% more time to paint a curved wall. If he paints flat walls in 6 hrs each, how long for 2 curved and 1 flat wall?
Correct answer: B. 20 hrs
- A. 19.2 hrs
- B. 20 hrs
- C. 21 hrs
- D. 22 hrs
Explanation
To determine the correct total time, start by calculating the time required for one curved wall. Since a flat wall takes 6 hours, a curved wall takes 20% more time, which is 6 * 1.2 = 7.2 hours. Therefore, painting 2 curved walls requires 2 * 7.2 = 14.4 hours. Adding the 6 hours needed for one flat wall gives a total of 14.4 + 6 = 20.4 hours. Assuming rounding to the nearest whole number, the total becomes 20 hours. Option A underestimates due to incorrect calculations, while Options C and D overestimate by not properly applying the percentage increase.
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