The average monthly income of 6 employees is Rs. 310. After one of them receives an increment the average rises to Rs. 315. Find the amount of increment.
Explanation:
Total wages earned by 6 employees = 6 × 310
Let I be the increment awarded. Then, (6 × 310 + i)/6 = 315
⇒ i = 30
Alternately,
Since the average of same 6 people increase by (315 – 310 =) 5, the total increases by 5 × 6 = 30.
∴ increment received = Rs. 30.
Hence, option (d).
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