24 students collected money for donation. The average contribution was ₹50. Later on, their teacher also contributed some money. Now the average contribution is ₹56. The teacher’s contribution is:
Total money contribution by 24 students = average $$\times no. of students = 50 \times 24$$ = 1200
Total money contribution by 24 students and their teacher = 56 $$\times 25$$ = 1400
Teacher’s contribution = 1400 - 1200 = Rs.200
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