Ras Bihari, a plumber, earned on an average Rs 925 per day in the month of January. He earned on an average Rs 881 per day during the first 20 days and Rs 915 per day during the last 20 days. What was his average income ( in rs) per day from 12th january to 20th January?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 805
Given:
Average earning of january month = Rs 925 per day
Average earning of first 20 days = Rs 881 per day
Average earning of last 20 days = Rs 915 per day
Concept Used:
Average = Sum of elements/Number of elements
Explanation:
Total earnings in the month of january = 925 × 31= 28675
Total earnings of first 20 days = 881 × 20 = 17620
Total earnings of last 20 days = 915 × 20 = 18300
Earning of 12th january to 20th january = (17620 + 18300) - 28675 = 7245
Hence average of earning of 12th january to 20th january = 7245/9 = 805.