25 students collected money for donation. The average contribution was Rs. 60. Later on, their teacher also contributed some money. Now the average contribution is Rs. 62. What is the contribution of teachers?
Answer & explanation
Correct answer: option 4
Total donation : 25 × 60 = 1500
Total donation including teacher: 26 × 62 = 1612
Donation given by teacher = 1612 - 1500 = Rs.112